Peter Hagoort

Publications

Displaying 1 - 11 of 11
  • Hagoort, P., & Indefrey, P. (1997). De neurale architectuur van het menselijk taalvermogen. In H. Peters (Ed.), Handboek stem-, spraak-, en taalpathologie (pp. 1-36). Houten: Bohn Stafleu Van Loghum.
  • Hagoort, P. (1997). De rappe prater als gewoontedier [Review of the book Smooth talkers: The linguistic performance of auctioneers and sportscasters, by Koenraad Kuiper]. Psychologie, 16, 22-23.
  • Hagoort, P., & Van Turennout, M. (1997). The electrophysiology of speaking: Possibilities of event-related potential research for speech production. In W. Hulstijn, H. Peters, & P. Van Lieshout (Eds.), Speech motor production and fluency disorders: Brain research in speech production (pp. 351-361). Amsterdam: Elsevier.
  • Hagoort, P. (1997). Semantic priming in Broca's aphasics at a short SOA: No support for an automatic access deficit. Brain and Language, 56, 287-300. doi:10.1006/brln.1997.1849.

    Abstract

    This study tests the recent claim that Broca’s aphasics are impaired in automatic lexical access, including the retrieval of word meaning. Subjects are required to perform a lexical decision on visually presented prime target pairs. Half of the word targets are preceded by a related word, half by an unrelated word. Primes and targets are presented with a long stimulus-onset-asynchrony (SOA) of 1400 msec and with a short SOA of 300 msec. Normal priming effects are observed in Broca’s aphasics for both SOAs. This result is discussed in the context of the claim that Broca’s aphasics suffer from an impairment in the automatic access of lexical–semantic information. It is argued that none of the current priming studies provides evidence supporting this claim, since with short SOAs priming effects have been reliably obtained in Broca’s aphasics. The results are more compatible with the claim that in many Broca’s aphasics the functional locus of their comprehension deficit is at the level of postlexical integration processes.
  • Hagoort, P., & Wassenaar, M. (1997). Taalstoornissen: Van theorie tot therapie. In B. Deelman, P. Eling, E. De Haan, A. Jennekens, & A. Van Zomeren (Eds.), Klinische Neuropsychologie (pp. 232-248). Meppel: Boom.
  • Hagoort, P. (1997). Zonder fosfor geen gedachten: Gagarin, geest en brein. In Brain & Mind (pp. 6-14). Utrecht: Reünistenvereniging Veritas.
  • Hagoort, P. (1997). Valt er nog te lachen zonder de rechter hersenhelft? Psychologie, 16, 52-55.
  • Indefrey, P., Kleinschmidt, A., Merboldt, K.-D., Krüger, G., Brown, C. M., Hagoort, P., & Frahm, J. (1997). Equivalent responses to lexical and nonlexical visual stimuli in occipital cortex: a functional magnetic resonance imaging study. Neuroimage, 5, 78-81. doi:10.1006/nimg.1996.0232.

    Abstract

    Stimulus-related changes in cerebral blood oxygenation were measured using high-resolution functional magnetic resonance imaging sequentially covering visual occipital areas in contiguous sections. During dynamic imaging, healthy subjects silently viewed pseudowords, single false fonts, or length-matched strings of the same false fonts. The paradigm consisted of a sixfold alternation of an activation and a control task. With pseudowords as activation vs single false fonts as control, responses were seen mainly in medial occipital cortex. These responses disappeared when pseudowords were alternated with false font strings as the control and reappeared when false font strings instead of pseudowords served as activation and were alternated with single false fonts. The string-length contrast alone, therefore, is sufficient to account for the activation pattern observed in medial visual cortex when word-like stimuli are contrasted with single characters.
  • Swaab, T. Y., Brown, C. M., & Hagoort, P. (1997). Spoken sentence comprehension in aphasia: Event-related potential evidence for a lexical integration deficit. Journal of Cognitive Neuroscience, 9(1), 39-66.

    Abstract

    In this study the N400 component of the event-related potential was used to investigate spoken sentence understanding in Broca's and Wernicke's aphasics. The aim of the study was to determine whether spoken sentence comprehension problems in these patients might result from a deficit in the on-line integration of lexical information. Subjects listened to sentences spoken at a normal rate. In half of these sentences, the meaning of the final word of the sentence matched the semantic specifications of the preceding sentence context. In the other half of the sentences, the sentence-final word was anomalous with respect to the preceding sentence context. The N400 was measured to the sentence-final words in both conditions. The results for the aphasic patients (n = 14) were analyzed according to the severity of their comprehension deficit and compared to a group of 12 neurologically unimpaired age-matched controls, as well as a group of 6 nonaphasic patients with a lesion in the right hemisphere. The nonaphasic brain damaged patients and the aphasic patients with a light comprehension deficit (high comprehenders, n = 7) showed an N400 effect that was comparable to that of the neurologically unimpaired subjects. In the aphasic patients with a moderate to severe comprehension deficit (low comprehenders, n = 7), a reduction and delay of the N400 effect was obtained. In addition, the P300 component was measured in a classical oddball paradigm, in which subjects were asked to count infrequent low tones in a random series of high and low tones. No correlation was found between the occurrence of N400 and P300 effects, indicating that changes in the N400 results were related to the patients' language deficit. Overall, the pattern of results was compatible with the idea that aphasic patients with moderate to severe comprehension problems are impaired in the integration of lexical information into a higher order representation of the preceding sentence context.
  • Van Turennout, M., Hagoort, P., & Brown, C. M. (1997). Electrophysiological evidence on the time course of semantic and phonological processes in speech production. Journal of Experimental Psychology: Learning, Memory, and Cognition, 23(4), 787-806.

    Abstract

    The temporal properties of semantic and phonological processes in speech production were investigated in a new experimental paradigm using movement-related brain potentials. The main experimental task was picture naming. In addition, a 2-choice reaction go/no-go procedure was included, involving a semantic and a phonological categorization of the picture name. Lateralized readiness potentials (LRPs) were derived to test whether semantic and phonological information activated motor processes at separate moments in time. An LRP was only observed on no-go trials when the semantic (not the phonological) decision determined the response hand. Varying the position of the critical phoneme in the picture name did not affect the onset of the LRP but rather influenced when the LRP began to differ on go and no-go trials and allowed the duration of phonological encoding of a word to be estimated. These results provide electrophysiological evidence for early semantic activation and later phonological encoding.
  • Wassenaar, M., Hagoort, P., & Brown, C. M. (1997). Syntactic ERP effects in Broca's aphasics with agrammatic comprehension. Brain and Language, 60, 61-64. doi:10.1006/brln.1997.1911.

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