Publications

Displaying 1 - 100 of 137
  • Ameka, F. K. (1999). [Review of M. E. Kropp Dakubu: Korle meets the sea: a sociolinguistic history of Accra]. Bulletin of the School of Oriental and African Studies, 62, 198-199. doi:10.1017/S0041977X0001836X.
  • Ameka, F. K. (1999). Partir c'est mourir un peu: Universal and culture specific features of leave taking. RASK International Journal of Language and Communication, 9/10, 257-283.
  • Ameka, F. K. (1999). Spatial information packaging in Ewe and Likpe: A comparative perspective. Frankfurter Afrikanistische Blätter, 11, 7-34.
  • Ameka, F. K. (1999). The typology and semantics of complex nominal duplication in Ewe. Anthropological Linguistics, 41, 75-106.
  • Bastiaansen, M. C. M., Böcker, K. B. E., Cluitmans, P. J. M., & Brunia, C. H. M. (1999). Event-related desynchronization related to the anticipation of a stimulus providing knowledge of results. Clinical Neurophysiology, 110, 250-260.

    Abstract

    In the present paper, event-related desynchronization (ERD) in the alpha and beta frequency bands is quantified in order to investigate the processes related to the anticipation of a knowledge of results (KR) stimulus. In a time estimation task, 10 subjects were instructed to press a button 4 s after the presentation of an auditory stimulus. Two seconds after the response they received auditory or visual feedback on the timing of their response. Preceding the button press, a centrally maximal ERD is found. Preceding the visual KR stimulus, an ERD is present that has an occipital maximum. Contrary to expectation, preceding the auditory KR stimulus there are no signs of a modalityspecific ERD. Results are related to a thalamo-cortical gating model which predicts a correspondence between negative slow potentials and ERD during motor preparation and stimulus anticipation.
  • Böcker, K. B. E., Bastiaansen, M. C. M., Vroomen, J., Brunia, C. H. M., & de Gelder, B. (1999). An ERP correlate of metrical stress in spoken word recognition. Psychophysiology, 36, 706-720. doi:10.1111/1469-8986.3660706.

    Abstract

    Rhythmic properties of spoken language such as metrical stress, that is, the alternation of strong and weak syllables, are important in speech recognition of stress-timed languages such as Dutch and English. Nineteen subjects listened passively to or discriminated actively between sequences of bisyllabic Dutch words, which started with either a weak or a strong syllable. Weak-initial words, which constitute 12% of the Dutch lexicon, evoked more negativity than strong-initial words in the interval between P2 and N400 components of the auditory event-related potential. This negativity was denoted as N325. The N325 was larger during stress discrimination than during passive listening. N325 was also larger when a weak-initial word followed sequence of strong-initial words than when it followed words with the same stress pattern. The latter difference was larger for listeners who performed well on stress discrimination. It was concluded that the N325 is probably a manifestation of the extraction of metrical stress from the acoustic signal and its transformation into task requirements.
  • Bowerman, M. (1976). Commentary on M.D.S. Braine, “Children's first word combinations”. Monographs of the Society for Research in Child Development, 41(1), 98-104. Retrieved from http://www.jstor.org/stable/1165959.
  • Brown, C. M., Hagoort, P., & Ter Keurs, M. (1999). Electrophysiological signatures of visual lexical processing: open en closed-class words. Journal of Cognitive Neuroscience, 11(3), 261-281.

    Abstract

    In this paper presents evidence of the disputed existence of an electrophysiological marker for the lexical-categorical distinction between open- and closed-class words. Event-related brain potentials were recorded from the scalp while subjects read a story. Separate waveforms were computed for open- and closed-class words. Two aspects of the waveforms could be reliably related to vocabulary class. The first was an early negativity in the 230- to 350-msec epoch, with a bilateral anterior predominance. This negativity was elicited by open- and closed-class words alike, was not affected by word frequency or word length, and had an earlier peak latency for closed-class words. The second was a frontal slow negative shift in the 350- to 500-msec epoch, largest over the left side of the scalp. This late negativity was only elicited by closed-class words. Although the early negativity cannot serve as a qualitative marker of the open- and closed-class distinction, it does reflect the earliest electrophysiological manifestation of the availability of categorical information from the mental lexicon. These results suggest that the brain honors the distinction between open- and closed-class words, in relation to the different roles that they play in on-line sentence processing.
  • Brown, P. (1999). Anthropologie cognitive. Anthropologie et Sociétés, 23(3), 91-119.

    Abstract

    In reaction to the dominance of universalism in the 1970s and '80s, there have recently been a number of reappraisals of the relation between language and cognition, and the field of cognitive anthropology is flourishing in several new directions in both America and Europe. This is partly due to a renewal and re-evaluation of approaches to the question of linguistic relativity associated with Whorf, and partly to the inspiration of modern developments in cognitive science. This review briefly sketches the history of cognitive anthropology and surveys current research on both sides of the Atlantic. The focus is on assessing current directions, considering in particular, by way of illustration, recent work in cultural models and on spatial language and cognition. The review concludes with an assessment of how cognitive anthropology could contribute directly both to the broader project of cognitive science and to the anthropological study of how cultural ideas and practices relate to structures and processes of human cognition.
  • Brown, P., & Levinson, S. C. (1993). 'Uphill' and 'downhill' in Tzeltal. Journal of Linguistic Anthropology, 3(1), 46-74. doi:10.1525/jlin.1993.3.1.46.

    Abstract

    In the face of the prevailing assumption among cognitive scientists that human spatial cognition is essentially egocentric, with objects located in reference to the orientation of ego's own body (hence left/right, up/down, and front/back oppositions), the Mayan language Tzeltal provides a telling counterexample. This article examines a set of conceptual oppositions in Tzeltal, uphill/downhill/across, that provides an absolute system of coordinates with respect to which the location of objects and their trajectories on both micro and macro scales are routinely described.
  • Brown, P. (1999). Repetition [Encyclopedia entry for 'Lexicon for the New Millenium', ed. Alessandro Duranti]. Journal of Linguistic Anthropology, 9(2), 223-226. doi:10.1525/jlin.1999.9.1-2.223.

    Abstract

    This is an encyclopedia entry describing conversational and interactional uses of linguistic repetition.
  • Brown, C. M., & Hagoort, P. (1993). The processing nature of the N400: Evidence from masked priming. Journal of Cognitive Neuroscience, 5, 34-44. doi:10.1162/jocn.1993.5.1.34.

    Abstract

    The N400 is an endogenous event-related brain potential (ERP) that is sensitive to semantic processes during language comprehension. The general question we address in this paper is which aspects of the comprehension process are manifest in the N400. The focus is on the sensitivity of the N400 to the automatic process of lexical access, or to the controlled process of lexical integration. The former process is the reflex-like and effortless behavior of computing a form representation of the linguistic signal, and of mapping this representation onto corresponding entries in the mental lexicon. The latter process concerns the integration of a spoken or written word into a higher-order meaning representation of the context within which it occurs. ERPs and reaction times (RTs) were acquired to target words preceded by semantically related and unrelated prime words. The semantic relationship between a prime and its target has been shown to modulate the amplitude of the N400 to the target. This modulation can arise from lexical access processes, reflecting the automatic spread of activation between words related in meaning in the mental lexicon. Alternatively, the N400 effect can arise from lexical integration processes, reflecting the relative ease of meaning integration between the prime and the target. To assess the impact of automatic lexical access processes on the N400, we compared the effect of masked and unmasked presentations of a prime on the N400 to a following target. Masking prevents perceptual identification, and as such it is claimed to rule out effects from controlled processes. It therefore enables a stringent test of the possible impact of automatic lexical access processes on the N400. The RT study showed a significant semantic priming effect under both unmasked and masked presentations of the prime. The result for masked priming reflects the effect of automatic spreading of activation during the lexical access process. The ERP study showed a significant N400 effect for the unmasked presentation condition, but no such effect for the masked presentation condition. This indicates that the N400 is not a manifestation of lexical access processes, but reflects aspects of semantic integration processes.
  • Brown, P. (1976). Women and politeness: A new perspective on language and society. Reviews in Anthropology, 3, 240-249.
  • Choi, S., McDonough, L., Bowerman, M., & Mandler, J. M. (1999). Early sensitivity to language-specific spatial categories in English and Korean. Cognitive Development, 14, 241-268. doi:10.1016/S0885-2014(99)00004-0.

    Abstract

    This study investigates young children’s comprehension of spatial terms in two languages that categorize space strikingly differently. English makes a distinction between actions resulting in containment (put in) versus support or surface attachment (put on), while Korean makes a cross-cutting distinction between tight-fit relations (kkita) versus loose-fit or other contact relations (various verbs). In particular, the Korean verb kkita refers to actions resulting in a tight-fit relation regardless of containment or support. In a preferential looking study we assessed the comprehension of in by 20 English learners and kkita by 10 Korean learners, all between 18 and 23 months. The children viewed pairs of scenes while listening to sentences with and without the target word. The target word led children to gaze at different and language-appropriate aspects of the scenes. We conclude that children are sensitive to language-specific spatial categories by 18–23 months.
  • Clifton, Jr., C., Cutler, A., McQueen, J. M., & Van Ooijen, B. (1999). The processing of inflected forms. [Commentary on H. Clahsen: Lexical entries and rules of language.]. Behavioral and Brain Sciences, 22, 1018-1019.

    Abstract

    Clashen proposes two distinct processing routes, for regularly and irregularly inflected forms, respectively, and thus is apparently making a psychological claim. We argue his position, which embodies a strictly linguistic perspective, does not constitute a psychological processing model.
  • Cutler, A. (1979). Contemporary reaction to Rudolf Meringer’s speech error research. Historiograpia Linguistica, 6, 57-76.
  • Cutler, A. (1980). La leçon des lapsus. La Recherche, 11(112), 686-692.
  • Cutler, A. (1976). High-stress words are easier to perceive than low-stress words, even when they are equally stressed. Texas Linguistic Forum, 2, 53-57.
  • Cutler, A. (1976). Phoneme-monitoring reaction time as a function of preceding intonation contour. Perception and Psychophysics, 20, 55-60. Retrieved from http://www.psychonomic.org/search/view.cgi?id=18194.

    Abstract

    An acoustically invariant one-word segment occurred in two versions of one syntactic context. In one version, the preceding intonation contour indicated that a stress would fall at the point where this word occurred. In the other version, the preceding contour predicted reduced stress at that point. Reaction time to the initial phoneme of the word was faster in the former case, despite the fact that no acoustic correlates of stress were present. It is concluded that a part of the sentence comprehension process is the prediction of upcoming sentence accents.
  • Cutler, A. (1993). Phonological cues to open- and closed-class words in the processing of spoken sentences. Journal of Psycholinguistic Research, 22, 109-131.

    Abstract

    Evidence is presented that (a) the open and the closed word classes in English have different phonological characteristics, (b) the phonological dimension on which they differ is one to which listeners are highly sensitive, and (c) spoken open- and closed-class words produce different patterns of results in some auditory recognition tasks. What implications might link these findings? Two recent lines of evidence from disparate paradigms—the learning of an artificial language, and natural and experimentally induced misperception of juncture—are summarized, both of which suggest that listeners are sensitive to the phonological reflections of open- vs. closed-class word status. Although these correlates cannot be strictly necessary for efficient processing, if they are present listeners exploit them in making word class assignments. That such a use of phonological information is of value to listeners could be indirect evidence that open- vs. closed-class words undergo different processing operations. Parts of the research reported in this paper were carried out in collaboration with Sally Butterfield and David Carter, and supported by the Alvey Directorate (United Kingdom). Jonathan Stankler's master's research was supported by the Science and Engineering Research Council (United Kingdom). Thanks to all of the above, and to Merrill Garrett, Mike Kelly, James McQueen, and Dennis Norris for further assistance.
  • Cutler, A., Kearns, R., Norris, D., & Scott, D. R. (1993). Problems with click detection: Insights from cross-linguistic comparisons. Speech Communication, 13, 401-410. doi:10.1016/0167-6393(93)90038-M.

    Abstract

    Cross-linguistic comparisons may shed light on the levels of processing involved in the performance of psycholinguistic tasks. For instance, if the same pattern of results appears whether or not subjects understand the experimental materials, it may be concluded that the results do not reflect higher-level linguistic processing. In the present study, English and French listeners performed two tasks - click location and speeded click detection - with both English and French sentences, closely matched for syntactic and phonological structure. Clicks were located more accurately in open- than in closed-class words in both English and French; they were detected more rapidly in open- than in closed-class words in English, but not in French. The two listener groups produced the same pattern of responses, suggesting that higher-level linguistic processing was not involved in the listeners' responses. It is concluded that click detection tasks are primarily sensitive to low-level (e.g. acoustic) effects, and hence are not well suited to the investigation of linguistic processing.
  • Cutler, A., & Norris, D. (1999). Sharpening Ockham’s razor (Commentary on W.J.M. Levelt, A. Roelofs & A.S. Meyer: A theory of lexical access in speech production). Behavioral and Brain Sciences, 22, 40-41.

    Abstract

    Language production and comprehension are intimately interrelated; and models of production and comprehension should, we argue, be constrained by common architectural guidelines. Levelt et al.'s target article adopts as guiding principle Ockham's razor: the best model of production is the simplest one. We recommend adoption of the same principle in comprehension, with consequent simplification of some well-known types of models.
  • Cutler, A. (1993). Segmentation problems, rhythmic solutions. Lingua, 92, 81-104. doi:10.1016/0024-3841(94)90338-7.

    Abstract

    The lexicon contains discrete entries, which must be located in speech input in order for speech to be understood; but the continuity of speech signals means that lexical access from spoken input involves a segmentation problem for listeners. The speech environment of prelinguistic infants may not provide special information to assist the infant listeners in solving this problem. Mature language users in possession of a lexicon might be thought to be able to avoid explicit segmentation of speech by relying on information from successful lexical access; however, evidence from adult perceptual studies indicates that listeners do use explicit segmentation procedures. These procedures differ across languages and seem to exploit language-specific rhythmic structure. Efficient as these procedures are, they may not have been developed in response to statistical properties of the input, because bilinguals, equally competent in two languages, apparently only possess one rhythmic segmentation procedure. The origin of rhythmic segmentation may therefore lie in the infant's exploitation of rhythm to solve the segmentation problem and gain a first toehold on lexical acquisition. Recent evidence from speech production and perception studies with prelinguistic infants supports the claim that infants are sensitive to rhythmic structure and its relationship to lexical segmentation.
  • Cutler, A. (1993). Segmenting speech in different languages. The Psychologist, 6(10), 453-455.
  • Cutler, A., & Otake, T. (1999). Pitch accent in spoken-word recognition in Japanese. Journal of the Acoustical Society of America, 105, 1877-1888.

    Abstract

    Three experiments addressed the question of whether pitch-accent information may be exploited in the process of recognizing spoken words in Tokyo Japanese. In a two-choice classification task, listeners judged from which of two words, differing in accentual structure, isolated syllables had been extracted ~e.g., ka from baka HL or gaka LH!; most judgments were correct, and listeners’ decisions were correlated with the fundamental frequency characteristics of the syllables. In a gating experiment, listeners heard initial fragments of words and guessed what the words were; their guesses overwhelmingly had the same initial accent structure as the gated word even when only the beginning CV of the stimulus ~e.g., na- from nagasa HLL or nagashi LHH! was presented. In addition, listeners were more confident in guesses with the same initial accent structure as the stimulus than in guesses with different accent. In a lexical decision experiment, responses to spoken words ~e.g., ame HL! were speeded by previous presentation of the same word ~e.g., ame HL! but not by previous presentation of a word differing only in accent ~e.g., ame LH!. Together these findings provide strong evidence that accentual information constrains the activation and selection of candidates for spoken-word recognition.
  • Cutler, A., & Mehler, J. (1993). The periodicity bias. Journal of Phonetics, 21, 101-108.
  • Diesveld, P., & Kempen, G. (1993). Zinnen als bouwwerken: Computerprogramma's voor grammatica-oefeningen. MOER, Tijdschrift voor onderwijs in het Nederlands, 1993(4), 130-138.
  • Edlinger, G., Bastiaansen, M. C. M., Brunia, C., Neuper, C., & Pfurtscheller, G. (1999). Cortical oscillatory activity assessed by combined EEG and MEG recordings and high resolution ERD methods. Biomedizinische Technik, 44(2), 131-134.
  • Enfield, N. J. (1999). On the indispensability of semantics: Defining the ‘vacuous’. Rask: internationalt tidsskrift for sprog og kommunikation, 9/10, 285-304.
  • Fisher, S. E., Stein, J. F., & Monaco, A. P. (1999). A genome-wide search strategy for identifying quantitative trait loci involved in reading and spelling disability (developmental dyslexia). European Child & Adolescent Psychiatry, 8(suppl. 3), S47-S51. doi:10.1007/PL00010694.

    Abstract

    Family and twin studies of developmental dyslexia have consistently shown that there is a significant heritable component for this disorder. However, any genetic basis for the trait is likely to be complex, involving reduced penetrance, phenocopy, heterogeneity and oligogenic inheritance. This complexity results in reduced power for traditional parametric linkage analysis, where specification of the correct genetic model is important. One strategy is to focus on large multigenerational pedigrees with severe phenotypes and/or apparent simple Mendelian inheritance, as has been successfully demonstrated for speech and language impairment. This approach is limited by the scarcity of such families. An alternative which has recently become feasible due to the development of high-throughput genotyping techniques is the analysis of large numbers of sib-pairs using allele-sharing methodology. This paper outlines our strategy for conducting a systematic genome-wide search for genes involved in dyslexia in a large number of affected sib-pair familites from the UK. We use a series of psychometric tests to obtain different quantitative measures of reading deficit, which should correlate with different components of the dyslexia phenotype, such as phonological awareness and orthographic coding ability. This enable us to use QTL (quantitative trait locus) mapping as a powerful tool for localising genes which may contribute to reading and spelling disability.
  • Fisher, S. E., Marlow, A. J., Lamb, J., Maestrini, E., Williams, D. F., Richardson, A. J., Weeks, D. E., Stein, J. F., & Monaco, A. P. (1999). A quantitative-trait locus on chromosome 6p influences different aspects of developmental dyslexia. American Journal of Human Genetics, 64(1), 146-156. doi:10.1086/302190.

    Abstract

    Recent application of nonparametric-linkage analysis to reading disability has implicated a putative quantitative-trait locus (QTL) on the short arm of chromosome 6. In the present study, we use QTL methods to evaluate linkage to the 6p25-21.3 region in a sample of 181 sib pairs from 82 nuclear families that were selected on the basis of a dyslexic proband. We have assessed linkage directly for several quantitative measures that should correlate with different components of the phenotype, rather than using a single composite measure or employing categorical definitions of subtypes. Our measures include the traditional IQ/reading discrepancy score, as well as tests of word recognition, irregular-word reading, and nonword reading. Pointwise analysis by means of sib-pair trait differences suggests the presence, in 6p21.3, of a QTL influencing multiple components of dyslexia, in particular the reading of irregular words (P=.0016) and nonwords (P=.0024). A complementary statistical approach involving estimation of variance components supports these findings (irregular words, P=.007; nonwords, P=.0004). Multipoint analyses place the QTL within the D6S422-D6S291 interval, with a peak around markers D6S276 and D6S105 consistently identified by approaches based on trait differences (irregular words, P=.00035; nonwords, P=.0035) and variance components (irregular words, P=.007; nonwords, P=.0038). Our findings indicate that the QTL affects both phonological and orthographic skills and is not specific to phoneme awareness, as has been previously suggested. Further studies will be necessary to obtain a more precise localization of this QTL, which may lead to the isolation of one of the genes involved in developmental dyslexia.
  • Frauenfelder, U. H., Baayen, R. H., Hellwig, F. M., & Schreuder, R. (1993). Neighborhood Density and Frequency Across Languages and Modalities. Journal of Memory and Language, 32(6), 781-804. doi:10.1006/jmla.1993.1039.

    Abstract

    This research exploits the English and Dutch CELEX lexical database to investigate the form similarity relations between words. Lexical statistics analyses replicate and extend the findings of Landauer and Streeter (1973) concerning the relation between a word′s frequency and the density and frequency of its similarity neighborhood. The results for both Dutch and English reveal only a weak tendency for high-frequency written and spoken words to have more neighbors than rare words and for these neighbors to be more frequent than those of rare words. However, the number of neighbors was found to correlate more highly with bigram frequency than with word frequency. To clarify the relations between these properties, a stochastic model is presented which captures the relevant effects of phonotactic structure on neighborhood similarities. The implications of these findings for models of language production and comprehension are considered.
  • Gullberg, M., & Holmqvist, K. (1999). Keeping an eye on gestures: Visual perception of gestures in face-to-face communication. Pragmatics & Cognition, 7(1), 35-63. doi:10.1075/pc.7.1.04gul.

    Abstract

    Since listeners usually look at the speaker's face, gestural information has to be absorbed through peripheral visual perception. In the literature, it has been suggested that listeners look at gestures under certain circumstances: 1) when the articulation of the gesture is peripheral; 2) when the speech channel is insufficient for comprehension; and 3) when the speaker him- or herself indicates that the gesture is worthy of attention. The research here reported employs eye tracking techniques to study the perception of gestures in face-to-face interaction. The improved control over the listener's visual channel allows us to test the validity of the above claims. We present preliminary findings substantiating claims 1 and 3, and relate them to theoretical proposals in the literature and to the issue of how visual and cognitive attention are related.
  • Hagoort, P. (1999). De toekomstige eeuw zonder psychologie. Psychologie Magazine, 18, 35-36.
  • Hagoort, P. (1993). [Review of the book Language: Structure, processing and disorders, by David Caplan]. Trends in Neurosciences, 16, 124. doi:10.1016/0166-2236(93)90138-C.
  • Hagoort, P., & Brown, C. M. (1999). Gender electrified: ERP evidence on the syntactic nature of gender processing. Journal of Psycholinguistic Research, 28(6), 715-728. doi:10.1023/A:1023277213129.

    Abstract

    The central issue of this study concerns the claim that the processing of gender agreement in online sentence comprehension is a syntactic rather than a conceptual/semantic process. This claim was tested for the grammatical gender agreement in Dutch between the definite article and the noun. Subjects read sentences in which the definite article and the noun had the same gender and sentences in which the gender agreement was violated, While subjects read these sentences, their electrophysiological activity was recorded via electrodes placed on the scalp. Earlier research has shown that semantic and syntactic processing events manifest themselves in different event-related brain potential (ERP) effects. Semantic integration modulates the amplitude of the so-called N400.The P600/SPS is an ERP effect that is more sensitive to syntactic processes. The violation of grammatical gender agreement was found to result in a P600/SPS. For violations in sentence-final position, an additional increase of the N400 amplitude was observed. This N400 effect is interpreted as resulting from the consequence of a syntactic violation for the sentence-final wrap-up. The overall pattern of results supports the claim that the on-line processing of gender agreement information is not a content driven but a syntactic-form driven process.
  • Hagoort, P. (1993). Impairments of lexical-semantic processing in aphasia: evidence from the processing of lexical ambiguities. Brain and Language, 45, 189-232. doi:10.1006/brln.1993.1043.

    Abstract

    Broca′s and Wernicke′s aphasics performed speeded lexical decisions on the third member of auditorily presented triplets consisting of two word primes followed by either a word or a nonword. In three of the four priming conditions, the second prime was a homonym with two unrelated meanings. The relation of the first prime and the target with the two meanings of the homonym was manipulated in the different priming conditions. The two readings of the ambiguous words either shared their grammatical form class (noun-noun ambiguities) or not (noun-verb ambiguities). The silent intervals between the members of the triplets were varied between 100, 500, and 1250 msec. Priming at the shortest interval is mainly attributed to automatic lexical processing, and priming at the longest interval is mainly due to forms of controlled lexical processing. For both Broca′s and Wernicke′s aphasics overall priming effects were obtained at ISIs of 100 and 500 msec, but not at an ISI of 1250 msec. This pattern of results is consistent with the view that both types of aphasics can automatically access the semantic lexicon, but might be impaired in integrating lexical-semantic information into the context. Broca′s aphasics showed a specific impairment in selecting the contextually appropriate reading of noun-verb ambiguities, which is suggested to result from a failure either in the on-line morphological parsing of complex word forms into a stem and an inflection or in the on-line exploitation of the syntactic implications of the inflectional suffix. In a final experiment patients were asked to explicitly judge the semantic relations between a subset of the primes that were used in the lexical decision study. Wernicke′s aphasics performed worse than both Broca′s aphasics and normal controls, indicating a specific impairment for these patients in consciously operating on automatically accessed lexical-semantic information.
  • Hagoort, P., & Brown, C. M. (1993). Hersenpotentialen als maat voor het menselijk taalvermogen. Stem, Spraak- en Taalpathologie, 2, 213-235.
  • Hagoort, P., & Brown, C. M. (1999). The consequences of the temporal interaction between syntactic and semantic processes for haemodynamic studies of language. NeuroImage, 9, S1024-S1024.
  • Hagoort, P., Ramsey, N., Rutten, G.-J., & Van Rijen, P. (1999). The role of the left anterior temporal cortex in language processing. Brain and Language, 69, 322-325. doi:10.1006/brln.1999.2169.
  • Hagoort, P., Brown, C. M., & Groothusen, J. (1993). The syntactic positive shift (SPS) as an ERP measure of syntactic processing. Language and Cognitive Processes, 8, 439-483. doi:10.1080/01690969308407585.

    Abstract

    This paper presents event-related brain potential (ERP) data from an experiment on syntactic processing. Subjects read individual sentences containing one of three different kinds of violations of the syntactic constraints of Dutch. The ERP results provide evidence for M electrophysiological response to syntactic processing that is qualitatively different from established ERP responses to semantic processing. We refer to this electro-physiological manifestation of parsing as the Syntactic Positive Shift (SPS). The SPS was observed in an experiment in which no task demands, other than to read the input, were imposed on the subjects. The pattern of responses to the different kinds of syntactic violations suggests that the SPS indicates the impossibility for the parser to assign the preferred structure to an incoming string of words, irrespective of the specific syntactic nature of this preferred structure. The implications of these findings for further research on parsing are discussed.
  • Hagoort, P., Indefrey, P., Brown, C. M., Herzog, H., Steinmetz, H., & Seitz, R. J. (1999). The neural circuitry involved in the reading of german words and pseudowords: A PET study. Journal of Cognitive Neuroscience, 11(4), 383-398. doi:10.1162/089892999563490.

    Abstract

    Silent reading and reading aloud of German words and pseudowords were used in a PET study using (15O)butanol to examine the neural correlates of reading and of the phonological conversion of legal letter strings, with or without meaning.
    The results of 11 healthy, right-handed volunteers in the age range of 25 to 30 years showed activation of the lingual gyri during silent reading in comparison with viewing a fixation cross. Comparisons between the reading of words and pseudowords suggest the involvement of the middle temporal gyri in retrieving both the phonological and semantic code for words. The reading of pseudowords activates the left inferior frontal gyrus, including the ventral part of Broca’s area, to a larger extent than the reading of words. This suggests that this area might be involved in the sublexical conversion of orthographic input strings into phonological output codes. (Pre)motor areas were found to be activated during both silent reading and reading aloud. On the basis of the obtained activation patterns, it is hypothesized that the articulation of high-frequency syllables requires the retrieval of their concomitant articulatory gestures from the SMA and that the articulation of lowfrequency syllables recruits the left medial premotor cortex.
  • Heritage, J., & Stivers, T. (1999). Online commentary in acute medical visits: A method of shaping patient expectations. Social Science and Medicine, 49(11), 1501-1517. doi:10.1016/S0277-9536(99)00219-1.
  • Hoeks, B., & Levelt, W. J. M. (1993). Pupillary dilation as a measure of attention: A quantitative system analysis. Behavior Research Methods, Instruments, & Computers, 25(1), 16-26.
  • Indefrey, P., & Levelt, W. J. M. (1999). A meta-analysis of neuroimaging experiments on word production. Neuroimage, 7, 1028.
  • Indefrey, P. (1999). Some problems with the lexical status of nondefault inflection. Behavioral and Brain Sciences, 22(6), 1025. doi:10.1017/S0140525X99342229.

    Abstract

    Clahsen's characterization of nondefault inflection as based exclusively on lexical entries does not capture the full range of empirical data on German inflection. In the verb system differential effects of lexical frequency seem to be input-related rather than affecting morphological production. In the noun system, the generalization properties of -n and -e plurals exceed mere analogy-based productivity.
  • Jusczyk, P. W., Cutler, A., & Redanz, N. J. (1993). Infants’ preference for the predominant stress patterns of English words. Child Development, 64, 675-687. Retrieved from http://www.jstor.org/stable/1131210.

    Abstract

    One critical aspect of language acquisition is the development of a lexicon that associates sounds and meanings; but developing a lexicon first requires that the infant segment utterances into individual words. How might the infant begin this process? The present study was designed to examine the potential role that sensitivity to predominant stress patterns of words might play in lexical development. In English, by far the majority of words have stressed (strong) initial syllables. Experiment 1 of our study demonstrated that by 9 months of age American infants listen significantly longer to words with strong/weak stress patterns than to words with weak/strong stress patterns. However, Experiment 2 showed that no significant preferences for the predominant stress pattern appear with 6-month-old infants, which suggests that the preference develops as a result of increasing familiarity with the prosodic features of the native language. In a third experiment, 9-month-olds showed a preference for strong/weak patterns even when the speech input was low-pass filtered, which suggests that their preference is specifically for the prosodic structure of the words. Together the results suggest that attention to predominant stress patterns in the native language may form an important part of the infant's process of developing a lexicon.
  • Kempen, G., & Kolk, H. (1980). Apentaal, een kwestie van intelligentie, niet van taalaanleg. Cahiers Biowetenschappen en Maatschappij, 6, 31-36.
  • Kempen, G. (1999). Fiets en (centri)fuge. Onze Taal, 68, 88.
  • Kempen, G. (1993). Mensentaal als computertaal. Onze Taal, 62, 275-277.
  • Kempen, G. (1979). La mise en paroles, aspects psychologiques de l'expression orale. Études de Linguistique Appliquée, 33, 19-28.

    Abstract

    Remarques sur les facteurs intervenant dans le processus de formulation des énoncés.
  • Kempen, G., & Van Wijk, C. (1980). Leren formuleren: Hoe uit opstellen een objektieve index voor formuleervaardigheid afgeleid kan worden. De Psycholoog, 15, 609-621.
  • Kempen, G. (1979). Psychologie van de zinsbouw: Een Wundtiaanse inleiding. Nederlands Tijdschrift voor de Psychologie, 34, 533-551.

    Abstract

    The psychology of language as developed by Wilhelm Wundt in his fundamental work Die Sprache (1900) has a strongly mentalistic character. The dominating positions held by behaviorism in psychology and structuralism in linguistics have overruled Wundt’s language theory to the effect that it has remained relatively unknown. This situation has changed recently under the influence of transformational linguistics and cognitive psychology. The paper discusses how Wundt applied the basic psychological concepts of apperception and association to language behavior, in particular to the construction and production of sentences during unprepared speech. The final part of the paper is devoted to the work, published in 1917, of the Dutch linguistic scholar Jacques van Ginneken, who elaborated Wundt’s ideas towards an explanation of some syntactic phenomena during the language acquisition of children.
  • Kempen, G. (1976). Syntactic constructions as retrieval plans. British Journal of Psychology, 67(2), 149-160. doi:10.1111/j.2044-8295.1976.tb01505.x.

    Abstract

    Four probe latency experiments show that the ‘constituent boundary effect’ (transitions between constituents are more difficult than within constituents) is a retrieval and not a storage phenomenon. The experimental logic used is called paraphrastic reproduction: after verbatim memorization of some sentences, subjects were instructed to reproduce them both in their original wording and in the form of sentences that, whilst preserving the original meaning, embodied different syntactic constructions. Syntactic constructions are defined as pairs which consist of a pattern of conceptual information and a syntactic scheme, i.e. a sequence of syntactic word categories and function words. For example, the sequence noun + finite intransitive main verb (‘John runs’) expresses a conceptual actor-action relationship. It is proposed that for each overlearned and simple syntactic construction there exists a retrieval plan which does the following. It searches through the long-term memory information that has been designated as the conceptual content of the utterance(s) to be produced, looking for a token of its conceptual pattern. The retrieved information is then cast into the format of its syntactic scheme. The organization of such plans is held responsible for the constituent boundary effect.
  • Kempen, G. (1984). Taaltechnologie voor het Nederlands: Vorderingen bij de bouw van een Nederlandstalig dialoog- en auteursysteem. Toegepaste Taalwetenschap in Artikelen, 19, 48-58.
  • Kempen, G., Konst, L., & De Smedt, K. (1984). Taaltechnologie voor het Nederlands: Vorderingen bij de bouw van een Nederlandstalig dialoog- en auteursysteem. Informatie, 26, 878-881.
  • Kempen, G. (1979). Woordwaarde. De Psycholoog, 14, 577.
  • Kempen, G. (1993). Zinsontleding kan een exact vak worden. Levende Talen, 483, 459-462.
  • Klein, W., & Musan, R. (Eds.). (1999). Das deutsche Perfekt [Special Issue]. Zeitschrift für Literaturwissenschaft und Linguistik, (113).
  • Klein, W. (1980). Der stand der Forschung zur deutschen Satzintonation. Linguistische Berichte, 68/80, 3-33.
  • Klein, W. (1976). Einige wesentliche Eigenschaften natürlicher Sprachen und ihre Bedeutung für die linguistische Theorie. Zeitschrift für Literaturwissenschaft und Linguistik, 23/24, 11-31.
  • Klein, W. (1976). Einleitung. Zeitschrift für Literaturwissenschaft und Linguistik; Metzler, Stuttgart, 6(23/24), 7-10.
  • Klein, W. (1979). Einleitung. Zeitschrift für Literaturwissenschaft und Linguistik; Metzler, Stuttgart, 9(33), 7-8.
  • Klein, W. (Ed.). (1980). Argumentation [Special Issue]. Zeitschrift für Literaturwissenschaft und Linguistik, (38/39).
  • Klein, W. (1980). Argumentation und Argument. Zeitschrift für Literaturwissenschaft und Linguistik, 38/39, 9-57.
  • Klein, W. (1980). Der Stand der Forschung zur deutschen Satzintonation. Linguistische Berichte, (68/80), 3-33.
  • Klein, W. (Ed.). (1976). Psycholinguistik [Special Issue]. Zeitschrift für Literaturwissenschaft und Linguistik, (23/24).
  • Klein, W. (Ed.). (1984). Textverständlichkeit - Textverstehen [Special Issue]. Zeitschrift für Literaturwissenschaft und Linguistik, (55).
  • Klein, W. (1980). Some remarks on Sanders' typology of elliptical coordinations. Linguistics, 18, 871-876.

    Abstract

    Starting with Ross (1970), various proposals have been made to classify elliptical coordinations and to characterize different languages according to the types of ellipses which they admit. Sanders (1977) discusses four of these proposals, shows that they are inadequate on various grounds and proposes a fifth typology whose central claim is 'evidently correct', as he states (p. 258). In the following, I shall briefly outline this typology and then show that it is inadequate, too. Since there is only one language 1 know — German — I will take all my examples from this language. Moreover, all examples will be straightforward and easy to be judged.
  • Klein, W. (Ed.). (1979). Sprache und Kontext [Special Issue]. Zeitschrift für Literaturwissenschaft und Linguistik, (33).
  • Klein, W. (1976). Sprachliche Variation. Studium Linguistik, 1, 29-46.
  • Klein, W. (1980). Vorwort. Zeitschrift für Literaturwissenschaft und Linguistik; Metzler, Stuttgart, 10, 7-8.
  • Klein, W. (1979). Wegauskünfte. Zeitschrift für Literaturwissenschaft und Linguistik, 33, 9-57.
  • Klein, W. (1993). Wie ist der Stand der germanistischen Sprachwissenschaft, und was können wir tun, um ihn zu verbessern? Zeitschrift für Literaturwissenschaft und Linguistik, 90/91, 40-52.
  • Klein, W. (1999). Wie sich das deutsche Perfekt zusammensetzt. Zeitschrift für Literaturwissenschaft und Linguistik; Metzler, Stuttgart, (113), 52-85.
  • Levelt, C. C., Schiller, N. O., & Levelt, W. J. M. (1999). A developmental grammar for syllable structure in the production of child language. Brain and Language, 68, 291-299.

    Abstract

    The order of acquisition of Dutch syllable types by first language learners is analyzed as following from an initial ranking and subsequent rerankings of constraints in an optimality theoretic grammar. Initially, structural constraints are all ranked above faithfulness constraints, leading to core syllable (CV) productions only. Subsequently, faithfulness gradually rises to the highest position in the ranking, allowing more and more marked syllable types to appear in production. Local conjunctions of Structural constraints allow for a more detailed analysis.
  • Levelt, W. J. M., Roelofs, A., & Meyer, A. S. (1999). A theory of lexical access in speech production. Behavioral and Brain Sciences, 22, 1-38. doi:10.1017/S0140525X99001776.

    Abstract

    Preparing words in speech production is normally a fast and accurate process. We generate them two or three per second in fluent conversation; and overtly naming a clear picture of an object can easily be initiated within 600 msec after picture onset. The underlying process, however, is exceedingly complex. The theory reviewed in this target article analyzes this process as staged and feedforward. After a first stage of conceptual preparation, word generation proceeds through lexical selection, morphological and phonological encoding, phonetic encoding, and articulation itself. In addition, the speaker exerts some degree of output control, by monitoring of self-produced internal and overt speech. The core of the theory, ranging from lexical selection to the initiation of phonetic encoding, is captured in a computational model, called WEAVER + +. Both the theory and the computational model have been developed in interaction with reaction time experiments, particularly in picture naming or related word production paradigms, with the aim of accounting. for the real-time processing in normal word production. A comprehensive review of theory, model, and experiments is presented. The model can handle some of the main observations in the domain of speech errors (the major empirical domain for most other theories of lexical access), and the theory opens new ways of approaching the cerebral organization of speech production by way of high-temporal-resolution imaging.
  • Levelt, W. J. M. (1999). Models of word production. Trends in Cognitive Sciences, 3, 223-232.

    Abstract

    Research on spoken word production has been approached from two angles. In one research tradition, the analysis of spontaneous or induced speech errors led to models that can account for speech error distributions. In another tradition, the measurement of picture naming latencies led to chronometric models accounting for distributions of reaction times in word production. Both kinds of models are, however, dealing with the same underlying processes: (1) the speaker’s selection of a word that is semantically and syntactically appropriate; (2) the retrieval of the word’s phonological properties; (3) the rapid syllabification of the word in context; and (4) the preparation of the corresponding articulatory gestures. Models of both traditions explain these processes in terms of activation spreading through a localist, symbolic network. By and large, they share the main levels of representation: conceptual/semantic, syntactic, phonological and phonetic. They differ in various details, such as the amount of cascading and feedback in the network. These research traditions have begun to merge in recent years, leading to highly constructive experimentation. Currently, they are like two similar knives honing each other. A single pair of scissors is in the making.
  • Levelt, W. J. M., Roelofs, A., & Meyer, A. S. (1999). Multiple perspectives on lexical access [authors' response ]. Behavioral and Brain Sciences, 22, 61-72. doi:10.1017/S0140525X99451775.
  • Levelt, W. J. M. (1984). Sprache und Raum. Texten und Schreiben, 20, 18-21.
  • Levelt, W. J. M., Schreuder, R., & Hoenkamp, E. (1976). Struktur und Gebrauch von Bewegungsverben. Zeitschrift für Literaturwissenschaft und Linguistik, 6(23/24), 131-152.
  • Levelt, W. J. M. (1993). Timing in speech production with special reference to word form encoding. Annals of the New York Academy of Sciences, 682, 283-295. doi:10.1111/j.1749-6632.1993.tb22976.x.
  • Levelt, W. J. M. (1979). On learnability: A reply to Lasnik and Chomsky. Unpublished manuscript.
  • Levinson, S. C., & Brown, P. (1993). Background to "Immanuel Kant among the Tenejapans". Anthropology Newsletter, 34(3), 22-23. doi:10.1111/an.1993.34.3.22.
  • Levinson, S. C. (1979). Activity types and language. Linguistics, 17, 365-399.
  • Levinson, S. C. (1999). Maxim. Journal of Linguistic Anthropology, 9, 144-147. doi:10.1525/jlin.1999.9.1-2.144.
  • Levinson, S. C. (1980). Speech act theory: The state of the art. Language teaching and linguistics: Abstracts, 5-24.

    Abstract

    Survey article
  • McQueen, J. M., Norris, D., & Cutler, A. (1999). Lexical influence in phonetic decision-making: Evidence from subcategorical mismatches. Journal of Experimental Psychology: Human Perception and Performance, 25, 1363-1389. doi:10.1037/0096-1523.25.5.1363.

    Abstract

    In 5 experiments, listeners heard words and nonwords, some cross-spliced so that they contained acoustic-phonetic mismatches. Performance was worse on mismatching than on matching items. Words cross-spliced with words and words cross-spliced with nonwords produced parallel results. However, in lexical decision and 1 of 3 phonetic decision experiments, performance on nonwords cross-spliced with words was poorer than on nonwords cross-spliced with nonwords. A gating study confirmed that there were misleading coarticulatory cues in the cross-spliced items; a sixth experiment showed that the earlier results were not due to interitem differences in the strength of these cues. Three models of phonetic decision making (the Race model, the TRACE model, and a postlexical model) did not explain the data. A new bottom-up model is outlined that accounts for the findings in terms of lexical involvement at a dedicated decision-making stage.
  • Meyer, A. S., & Bock, K. (1999). Representations and processes in the production of pronouns: Some perspectives from Dutch. Journal of Memory and Language, 41(2), 281-301. doi:doi:10.1006/jmla.1999.2649.

    Abstract

    The production and interpretation of pronouns involves the identification of a mental referent and, in connected speech or text, a discourse antecedent. One of the few overt signals of the relationship between a pronoun and its antecedent is agreement in features such as number and grammatical gender. To examine how speakers create these signals, two experiments tested conceptual, lexical. and morphophonological accounts of pronoun production in Dutch. The experiments employed sentence completion and continuation tasks with materials containing noun phrases that conflicted or agreed in grammatical gender. The noun phrases served as the antecedents for demonstrative pronouns tin Experiment 1) and relative pronouns tin Experiment 2) that required gender marking. Gender errors were used to assess the nature of the processes that established the link between pronouns and antecedents. There were more gender errors when candidate antecedents conflicted in grammatical gender, counter to the predictions of a pure conceptual hypothesis. Gender marking on candidate antecedents did not change the magnitude of this interference effect, counter to the predictions of an overt-morphology hypothesis. Mirroring previous findings about pronoun comprehension, the results suggest that speakers of gender-marking languages call on specific linguistic information about antecedents in order to select pronouns and that the information consists of specifications of grammatical gender associated with the lemmas of words.
  • Nix, A. J., Mehta, G., Dye, J., & Cutler, A. (1993). Phoneme detection as a tool for comparing perception of natural and synthetic speech. Computer Speech and Language, 7, 211-228. doi:10.1006/csla.1993.1011.

    Abstract

    On simple intelligibility measures, high-quality synthesiser output now scores almost as well as natural speech. Nevertheless, it is widely agreed that perception of synthetic speech is a harder task for listeners than perception of natural speech; in particular, it has been hypothesized that listeners have difficulty identifying phonemes in synthetic speech. If so, a simple measure of the speed with which a phoneme can be identified should prove a useful tool for comparing perception of synthetic and natural speech. The phoneme detection task was here used in three experiments comparing perception of natural and synthetic speech. In the first, response times to synthetic and natural targets were not significantly different, but in the second and third experiments response times to synthetic targets were significantly slower than to natural targets. A speed-accuracy tradeoff in the third experiment suggests that an important factor in this task is the response criterion adopted by subjects. It is concluded that the phoneme detection task is a useful tool for investigating phonetic processing of synthetic speech input, but subjects must be encouraged to adopt a response criterion which emphasizes rapid responding. When this is the case, significantly longer response times for synthetic targets can indicate a processing disadvantage for synthetic speech at an early level of phonetic analysis.
  • Osterhout, L., & Hagoort, P. (1999). A superficial resemblance does not necessarily mean you are part of the family: Counterarguments to Coulson, King and Kutas (1998) in the P600/SPS-P300 debate. Language and Cognitive Processes, 14, 1-14. doi:10.1080/016909699386356.

    Abstract

    Two recent studies (Coulson et al., 1998;Osterhout et al., 1996)examined the
    relationship between the event-related brain potential (ERP) responses to linguistic syntactic anomalies (P600/SPS) and domain-general unexpected events (P300). Coulson et al. concluded that these responses are highly similar, whereas Osterhout et al. concluded that they are distinct. In this comment, we evaluate the relativemerits of these claims. We conclude that the available evidence indicates that the ERP response to syntactic anomalies is at least partially distinct from the ERP response to unexpected anomalies that do not involve a grammatical violation
  • Otake, T., Hatano, G., Cutler, A., & Mehler, J. (1993). Mora or syllable? Speech segmentation in Japanese. Journal of Memory and Language, 32, 258-278. doi:10.1006/jmla.1993.1014.

    Abstract

    Four experiments examined segmentation of spoken Japanese words by native and non-native listeners. Previous studies suggested that language rhythm determines the segmentation unit most natural to native listeners: French has syllabic rhythm, and French listeners use the syllable in segmentation, while English has stress rhythm, and segmentation by English listeners is based on stress. The rhythm of Japanese is based on a subsyllabic unit, the mora. In the present experiments Japanese listeners′ response patterns were consistent with moraic segmentation; acoustic artifacts could not have determined the results since nonnative (English and French) listeners showed different response patterns with the same materials. Predictions of a syllabic hypothesis were disconfirmed in the Japanese listeners′ results; in contrast, French listeners showed a pattern of responses consistent with the syllabic hypothesis. The results provide further evidence that listeners′ segmentation of spoken words relies on procedures determined by the characteristic phonology of their native language.
  • Otake, T., & Cutler, A. (1999). Perception of suprasegmental structure in a nonnative dialect. Journal of Phonetics, 27, 229-253. doi:10.1006/jpho.1999.0095.

    Abstract

    Two experiments examined the processing of Tokyo Japanese pitchaccent distinctions by native speakers of Japanese from two accentlessvariety areas. In both experiments, listeners were presented with Tokyo Japanese speech materials used in an earlier study with Tokyo Japanese listeners, who clearly exploited the pitch-accent information in spokenword recognition. In the "rst experiment, listeners judged from which of two words, di!ering in accentual structure, isolated syllables had been extracted. Both new groups were, overall, as successful at this task as Tokyo Japanese speakers had been, but their response patterns differed from those of the Tokyo Japanese, for instance in that a bias towards H judgments in the Tokyo Japanese responses was weakened in the present groups' responses. In a second experiment, listeners heard word fragments and guessed what the words were; in this task, the speakers from accentless areas again performed significantly above chance, but their responses showed less sensitivity to the information in the input, and greater bias towards vocabulary distribution frequencies, than had been observed with the Tokyo Japanese listeners. The results suggest that experience with a local accentless dialect affects the processing of accent for word recognition in Tokyo Japanese, even for listeners with extensive exposure to Tokyo Japanese.
  • Petersson, K. M., Elfgren, C., & Ingvar, M. (1999). Dynamic changes in the functional anatomy of the human brain during recall of abstract designs related to practice. Neuropsychologia, 37, 567-587.

    Abstract

    In the present PET study we explore some functional aspects of the interaction between attentional/control processes and learning/memory processes. The network of brain regions supporting recall of abstract designs were studied in a less practiced and in a well practiced state. The results indicate that automaticity, i.e., a decreased dependence on attentional and working memory resources, develops as a consequence of practice. This corresponds to the practice related decreases of activity in the prefrontal, anterior cingulate, and posterior parietal regions. In addition, the activity of the medial temporal regions decreased as a function of practice. This indicates an inverse relation between the strength of encoding and the activation of the MTL during retrieval. Furthermore, the pattern of practice related increases in the auditory, posterior insular-opercular extending into perisylvian supra marginal region, and the right mid occipito-temporal region, may reflect a lower degree of inhibitory attentional modulation of task irrelevant processing and more fully developed representations of the abstract designs, respectively. We also suggest that free recall is dependent on bilateral prefrontal processing, in particular non-automatic free recall. The present results cofirm previous functional neuroimaging studies of memory retrieval indicating that recall is subserved by a network of interacting brain regions. Furthermore, the results indicate that some components of the neural network subserving free recall may have a dynamic role and that there is a functional restructuring of the information processing networks during the learning process.
  • Petersson, K. M., Reis, A., Castro-Caldas, A., & Ingvar, M. (1999). Effective auditory-verbal encoding activates the left prefrontal and the medial temporal lobes: A generalization to illiterate subjects. NeuroImage, 10, 45-54. doi:10.1006/nimg.1999.0446.

    Abstract

    Recent event-related FMRI studies indicate that the prefrontal (PFC) and the medial temporal lobe (MTL) regions are more active during effective encoding than during ineffective encoding. The within-subject design and the use of well-educated young college students in these studies makes it important to replicate these results in other study populations. In this PET study, we used an auditory word-pair association cued-recall paradigm and investigated a group of healthy upper middle-aged/older illiterate women. We observed a positive correlation between cued-recall success and the regional cerebral blood flow of the left inferior PFC (BA 47) and the MTLs. Specifically, we used the cuedrecall success as a covariate in a general linear model and the results confirmed that the left inferior PFC and the MTLare more active during effective encoding than during ineffective encoding. These effects were observed during encoding of both semantically and phonologically related word pairs, indicating that these effects are robust in the studied population, that is, reproducible within group. These results generalize the results of Brewer et al. (1998, Science 281, 1185– 1187) and Wagner et al. (1998, Science 281, 1188–1191) to an upper middle aged/older illiterate population. In addition, the present study indicates that effective relational encoding correlates positively with the activity of the anterior medial temporal lobe regions.
  • Petersson, K. M., Elfgren, C., & Ingvar, M. (1999). Learning-related effects and functional neuroimaging. Human Brain Mapping, 7, 234-243. doi:10.1002/(SICI)1097-0193(1999)7:4<234:AID-HBM2>3.0.CO;2-O.

    Abstract

    A fundamental problem in the study of learning is that learning-related changes may be confounded by nonspecific time effects. There are several strategies for handling this problem. This problem may be of greater significance in functional magnetic resonance imaging (fMRI) compared to positron emission tomography (PET). Using the general linear model, we describe, compare, and discuss two approaches for separating learning-related from nonspecific time effects. The first approach makes assumptions on the general behavior of nonspecific effects and explicitly models these effects, i.e., nonspecific time effects are incorporated as a linear or nonlinear confounding covariate in the statistical model. The second strategy makes no a priori assumption concerning the form of nonspecific time effects, but implicitly controls for nonspecific effects using an interaction approach, i.e., learning effects are assessed with an interaction contrast. The two approaches depend on specific assumptions and have specific limitations. With certain experimental designs, both approaches may be used and the results compared, lending particular support to effects that are independent of the method used. A third and perhaps better approach that sometimes may be practically unfeasible is to use a completely temporally balanced experimental design. The choice of approach may be of particular importance when learning related effects are studied with fMRI.
  • Petersson, K. M., Nichols, T. E., Poline, J.-B., & Holmes, A. P. (1999). Statistical limitations in functional neuroimaging I: Non-inferential methods and statistical models. Philosofical Transactions of the Royal Soeciety B, 354, 1239-1260.
  • Petersson, K. M., Nichols, T. E., Poline, J.-B., & Holmes, A. P. (1999). Statistical limitations in functional neuroimaging II: Signal detection and statistical inference. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 354, 1261-1282.
  • Petrovic, P., Ingvar, M., Stone-Elander, S., Petersson, K. M., & Hansson, P. (1999). A PET activation study of dynamic mechanical allodynia in patients with mononeuropathy. Pain, 83, 459-470.

    Abstract

    The objective of this study was to investigate the central processing of dynamic mechanical allodynia in patients with mononeuropathy. Regional cerebral bloodflow, as an indicator of neuronal activity, was measured with positron emission tomography. Paired comparisons were made between three different states; rest, allodynia during brushing the painful skin area, and brushing of the homologous contralateral area. Bilateral activations were observed in the primary somatosensory cortex (S1) and the secondary somatosensory cortex (S2) during allodynia compared to rest. The S1 activation contralateral to the site of the stimulus was more expressed during allodynia than during innocuous touch. Significant activations of the contralateral posterior parietal cortex, the periaqueductal gray (PAG), the thalamus bilaterally and motor areas were also observed in the allodynic state compared to both non-allodynic states. In the anterior cingulate cortex (ACC) there was only a suggested activation when the allodynic state was compared with the non-allodynic states. In order to account for the individual variability in the intensity of allodynia and ongoing spontaneous pain, rCBF was regressed on the individually reported pain intensity, and significant covariations were observed in the ACC and the right anterior insula. Significantly decreased regional blood flow was observed bilaterally in the medial and lateral temporal lobe as well as in the occipital and posterior cingulate cortices when the allodynic state was compared to the non-painful conditions. This finding is consistent with previous studies suggesting attentional modulation and a central coping strategy for known and expected painful stimuli. Involvement of the medial pain system has previously been reported in patients with mononeuropathy during ongoing spontaneous pain. This study reveals a bilateral activation of the lateral pain system as well as involvement of the medial pain system during dynamic mechanical allodynia in patients with mononeuropathy.
  • Praamstra, P., Plat, E. M., Meyer, A. S., & Horstink, M. W. I. M. (1999). Motor cortex activation in Parkinson's disease: Dissociation of electrocortical and peripheral measures of response generation. Movement Disorders, 14, 790-799. doi:10.1002/1531-8257(199909)14:5<790:AID-MDS1011>3.0.CO;2-A.

    Abstract

    This study investigated characteristics of motor cortex activation and response generation in Parkinson's disease with measures of electrocortical activity (lateralized readiness potential [LRP]), electromyographic activity (EMG), and isometric force in a noise-compatibility task. When presented with stimuli consisting of incompatible target and distracter elements asking for responses of opposite hands, patients were less able than control subjects to suppress activation of the motor cortex controlling the wrong response hand. This was manifested in the pattern of reaction times and in an incorrect lateralization of the LRP. Onset latency and rise time of the LRP did not differ between patients and control subjects, but EMG and response force developed more slowly in patients. Moreover, in patients but not in control subjects, the rate of development of EMG and response force decreased as reaction time increased. We hypothesize that this dissociation between electrocortical activity and peripheral measures in Parkinson's disease is the result of changes in motor cortex function that alter the relation between signal-related and movement-related neural activity in the motor cortex. In the LRP, this altered balance may obscure an abnormal development of movement-related neural activity.

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