Publications

Displaying 1 - 13 of 13
  • Ernestus, M. (2012). Segmental within-speaker variation. In A. C. Cohn, C. Fougeron, & M. K. Huffman (Eds.), The Oxford handbook of laboratory phonology (pp. 93-102). New York: Oxford University Press.
  • Hanique, I., & Ernestus, M. (2012). The processes underlying two frequent casual speech phenomena in Dutch: A production experiment. In Proceedings of INTERSPEECH 2012: 13th Annual Conference of the International Speech Communication Association (pp. 2011-2014).

    Abstract

    This study investigated whether a shadowing task can provide insights in the nature of reduction processes that are typical of casual speech. We focused on the shortening and presence versus absence of schwa and /t/ in Dutch past participles. Results showed that the absence of these segments was affected by the same variables as their shortening, suggesting that absence mostly resulted from extreme gradient shortening. This contrasts with results based on recordings of spontaneous conversations. We hypothesize that this difference is due to non-casual fast speech elicited by a shadowing task.
  • Hanique, I., & Ernestus, M. (2012). The role of morphology in acoustic reduction. Lingue e linguaggio, 2012(2), 147-164. doi:10.1418/38783.

    Abstract

    This paper examines the role of morphological structure in the reduced pronunciation of morphologically complex words by discussing and re-analyzing data from the literature. Acoustic reduction refers to the phenomenon that, in spontaneous speech, phonemes may be shorter or absent. We review studies investigating effects of the repetition of a morpheme, of whether a segment plays a crucial role in the identification of its morpheme, and of a word's morphological decomposability. We conclude that these studies report either no effects of morphological structure or effects that are open to alternative interpretations. Our analysis also reveals the need for a uniform definition of morphological decomposability. Furthermore, we examine whether the reduction of segments in morphologically complex words correlates with these segments' contribution to the identification of the whole word, and discuss previous studies and new analyses supporting this hypothesis. We conclude that the data show no convincing evidence that morphological structure conditions reduction, which contrasts with the expectations of several models of speech production and of morphological processing (e.g., weaver++ and dual-route models). The data collected so far support psycholinguistic models which assume that all morphologically complex words are processed as complete units.
  • Schuppler, B., van Dommelen, W. A., Koreman, J., & Ernestus, M. (2012). How linguistic and probabilistic properties of a word affect the realization of its final /t/: Studies at the phonemic and sub-phonemic level. Journal of Phonetics, 40, 595-607. doi:10.1016/j.wocn.2012.05.004.

    Abstract

    This paper investigates the realization of word-final /t/ in conversational standard Dutch. First, based on a large number of word tokens (6747) annotated with broad phonetic transcription by an automatic transcription tool, we show that morphological properties of the words and their position in the utterance's syntactic structure play a role for the presence versus absence of their final /t/. We also replicate earlier findings on the role of predictability (word frequency and bigram frequency with the following word) and provide a detailed analysis of the role of segmental context. Second, we analyze the detailed acoustic properties of word-final /t/ on the basis of a smaller number of tokens (486) which were annotated manually. Our data show that word and bigram frequency as well as segmental context also predict the presence of sub-phonemic properties. The investigations presented in this paper extend research on the realization of /t/ in spontaneous speech and have potential consequences for psycholinguistic models of speech production and perception as well as for automatic speech recognition systems.
  • Torreira, F., & Ernestus, M. (2012). Weakening of intervocalic /s/ in the Nijmegen Corpus of Casual Spanish. Phonetica, 69, 124-148. doi:10.1159/000343635.
  • Van de Ven, M., Ernestus, M., & Schreuder, R. (2012). Predicting acoustically reduced words in spontaneous speech: The role of semantic/syntactic and acoustic cues in context. Laboratory Phonology, 3, 455-481. doi:10.1515/lp-2012-0020.

    Abstract

    In spontaneous speech, words may be realised shorter than in formal speech (e.g., English yesterday may be pronounced like [jɛʃeɩ]). Previous research has shown that context is required to understand highly reduced pronunciation variants. We investigated the extent to which listeners can predict low predictability reduced words on the basis of the semantic/syntactic and acoustic cues in their context. In four experiments, participants were presented with either the preceding context or the preceding and following context of reduced words, and either heard these fragments of conversational speech, or read their orthographic transcriptions. Participants were asked to predict the missing reduced word on the basis of the context alone, choosing from four plausible options. Participants made use of acoustic cues in the context, although casual speech typically has a high speech rate, and acoustic cues are much more unclear than in careful speech. Moreover, they relied on semantic/syntactic cues. Whenever there was a conflict between acoustic and semantic/syntactic contextual cues, measured as the word's probability given the surrounding words, listeners relied more heavily on acoustic cues. Further, context appeared generally insufficient to predict the reduced words, underpinning the significance of the acoustic characteristics of the reduced words themselves.
  • Viebahn, M. C., Ernestus, M., & McQueen, J. M. (2012). Co-occurrence of reduced word forms in natural speech. In Proceedings of INTERSPEECH 2012: 13th Annual Conference of the International Speech Communication Association (pp. 2019-2022).

    Abstract

    This paper presents a corpus study that investigates the co-occurrence of reduced word forms in natural speech. We extracted Dutch past participles from three different speech registers and investigated the influence of several predictor variables on the presence and duration of schwas in prefixes and /t/s in suffixes. Our results suggest that reduced word forms tend to co-occur even if we partial out the effect of speech rate. The implications of our findings for episodic and abstractionist models of lexical representation are discussed.
  • Ernestus, M. (2009). The roles of reconstruction and lexical storage in the comprehension of regular pronunciation variants. In Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech 2009) (pp. 1875-1878). Causal Productions Pty Ltd.

    Abstract

    This paper investigates how listeners process regular pronunciation variants, resulting from simple general reduction processes. Study 1 shows that when listeners are presented with new words, they store the pronunciation variants presented to them, whether these are unreduced or reduced. Listeners thus store information on word-specific pronunciation variation. Study 2 suggests that if participants are presented with regularly reduced pronunciations, they also reconstruct and store the corresponding unreduced pronunciations. These unreduced pronunciations apparently have special status. Together the results support hybrid models of speech processing, assuming roles for both exemplars and abstract representations.
  • Janse, E., & Ernestus, M. (2009). Recognition of reduced speech and use of phonetic context in listeners with age-related hearing impairment [Abstract]. Journal of the Acoustical Society of America, 125(4), 2535.
  • Schuppler, B., Van Dommelen, W., Koreman, J., & Ernestus, M. (2009). Word-final [t]-deletion: An analysis on the segmental and sub-segmental level. In Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech 2009) (pp. 2275-2278). Causal Productions Pty Ltd.

    Abstract

    This paper presents a study on the reduction of word-final [t]s in conversational standard Dutch. Based on a large amount of tokens annotated on the segmental level, we show that the bigram frequency and the segmental context are the main predictors for the absence of [t]s. In a second study, we present an analysis of the detailed acoustic properties of word-final [t]s and we show that bigram frequency and context also play a role on the subsegmental level. This paper extends research on the realization of /t/ in spontaneous speech and shows the importance of incorporating sub-segmental properties in models of speech.
  • Torreira, F., & Ernestus, M. (2009). Probabilistic effects on French [t] duration. In Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech 2009) (pp. 448-451). Causal Productions Pty Ltd.

    Abstract

    The present study shows that [t] consonants are affected by probabilistic factors in a syllable-timed language as French, and in spontaneous as well as in journalistic speech. Study 1 showed a word bigram frequency effect in spontaneous French, but its exact nature depended on the corpus on which the probabilistic measures were based. Study 2 investigated journalistic speech and showed an effect of the joint frequency of the test word and its following word. We discuss the possibility that these probabilistic effects are due to the speaker’s planning of upcoming words, and to the speaker’s adaptation to the listener’s needs.
  • Van de Ven, M., Tucker, B. V., & Ernestus, M. (2009). Semantic context effects in the recognition of acoustically unreduced and reduced words. In Proceedings of the 10th Annual Conference of the International Speech Communication Association (pp. 1867-1870). Causal Productions Pty Ltd.

    Abstract

    Listeners require context to understand the casual pronunciation variants of words that are typical of spontaneous speech (Ernestus et al., 2002). The present study reports two auditory lexical decision experiments, investigating listeners' use of semantic contextual information in the comprehension of unreduced and reduced words. We found a strong semantic priming effect for low frequency unreduced words, whereas there was no such effect for reduced words. Word frequency was facilitatory for all words. These results show that semantic context is relevant especially for the comprehension of unreduced words, which is unexpected given the listener driven explanation of reduction in spontaneous speech.
  • Ernestus, M., Baayen, R. H., & Schreuder, R. (2002). The recognition of reduced word forms. Brain and Language, 81(1-3), 162-173. doi:10.1006/brln.2001.2514.

    Abstract

    This article addresses the recognition of reduced word forms, which are frequent in casual speech. We describe two experiments on Dutch showing that listeners only recognize highly reduced forms well when these forms are presented in their full context and that the probability that a listener recognizes a word form in limited context is strongly correlated with the degree of reduction of the form. Moreover, we show that the effect of degree of reduction can only partly be interpreted as the effect of the intelligibility of the acoustic signal, which is negatively correlated with degree of reduction. We discuss the consequences of our findings for models of spoken word recognition and especially for the role that storage plays in these models.

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