Phonetic variation in consonants in infant-directed and adult-directed speech: the case of regressive place assimilation in word-final alveolar stops*

ABSTRACT Pronunciation variation is under-studied in infant-directed speech, particularly for consonants. Regressive place assimilation involves a word-final alveolar stop taking the place of articulation of a following word-initial consonant. We investigated pronunciation variation in word-final alveolar stop consonants in storybooks read by forty-eight mothers in adult-directed or infant-directed style to infants aged approximately 0;3, 0;9, 1;1, or 1;8. We focused on phonological environments where regressive place assimilation could occur, i.e., when the stop preceded a word-initial labial or velar consonant. Spectrogram, waveform, and perceptual evidence was used to classify tokens into four pronunciation categories: canonical, assimilated, glottalized, or deleted. Results showed a reliable tendency for canonical variants to occur in infant-directed speech more often than in adult-directed speech. However, the otherwise very similar distributions of variants across addressee and age group suggested that infants largely experience statistical distributions of non-canonical consonantal pronunciation variants that mirror those experienced by adults.

[1]  James Dean Brown,et al.  STATISTICAL TECHNIQUES FOR THE STUDY OF LANGUAGE AND LANGUAGE BEHAVIOR . Rietveld Toni and Roeland van Hout. Berlin: Mouton de Gruyter, 1993. Pp. xi + 400. DM 58. , 1994, Studies in Second Language Acquisition.

[2]  P. Kuhl,et al.  Cross-language analysis of phonetic units in language addressed to infants. , 1997, Science.

[3]  Laura C. Dilley,et al.  A study of regressive place assimilation in spontaneous speech and its implications for spoken word recognition. , 2007, The Journal of the Acoustical Society of America.

[4]  C. Snow.  The development of conversation between mothers and babies , 1977, Journal of Child Language.

[5]  Rachel M. Miller,et al.  Mothers' Speech to Hearing‐Impaired Infants and Children With Cochlear Implants , 2006 .

[6]  Stefanie Shattuck-Hufnagel,et al.  A prosody tutorial for investigators of auditory sentence processing , 1996, Journal of psycholinguistic research.

[7]  E. Bard,et al.  The unintelligibility of speech to children , 1983, Journal of Child Language.

[8]  D. Gow.  Does English coronal place assimilation create lexical ambiguity , 2002 .

[9]  S. Trehub,et al.  Absolute Pitch and Tempo in Mothers' Songs to Infants , 2002, Psychological science.

[10]  Arthur S. Abramson,et al.  Voice Timing: Cross‐Language Experiments in Identification and Discrimination , 1968 .

[11]  S. Suter.  Meaningful differences in the everyday experience of young American children , 2005, European Journal of Pediatrics.

[12]  Louis Goldstein,et al.  Gestural specification using dynamically-defined articulatory structures , 1990 .

[13]  D. Burnham,et al.  What's New, Pussycat? On Talking to Babies and Animals , 2002, Science.

[14]  K. Stevens,et al.  Linguistic experience alters phonetic perception in infants by 6 months of age. , 1992, Science.

[15]  S L Oviatt,et al.  The emerging ability to comprehend language: an experimental approach. , 1980, Child development.

[16]  Klaus J. Kohler,et al.  Segmental Reduction in Connected Speech in German: Phonological Facts and Phonetic Explanations , 1990 .

[17]  Francis Nolan,et al.  Phonology and Phonetic Evidence: The influence of syntactic structure on [s] to [∫] assimilation , 1995 .

[18]  Rajend Mesthrie,et al.  A Handbook of Varieties of English , 2004 .

[19]  Dawn M. Behne,et al.  Changes in infant directed speech in the first six months , 2006 .

[20]  D. Gow.  Feature parsing: Feature cue mapping in spoken word recognition , 2003, Perception & psychophysics.

[21]  Jessica Maye,et al.  Infant sensitivity to distributional information can affect phonetic discrimination , 2002, Cognition.

[22]  J. Stemberger,et al.  Optimality Theory , 2003 .

[23]  Nan Bernstein Ratner,et al.  Cues to post-vocalic voicing in mother-child speech , 1984 .

[24]  Caroline Bowen,et al.  Children's Speech Sound Disorders , 2009 .

[25]  Jean Carletta,et al.  Assessing Agreement on Classification Tasks: The Kappa Statistic , 1996, CL.

[26]  Edward Gibson,et al.  Inter-transcriber reliability for two systems of prosodic annotation: ToBI (Tones and Break Indices) and RaP (Rhythm and Pitch) , 2012 .

[27]  Linda Shockey,et al.  Sound Patterns of Spoken English , 2003 .

[28]  Francis Nolan,et al.  Modelling [s] to [∫] accommodation in English , 1996 .

[29]  Anne Fernald,et al.  Does input influence uptake? Links between maternal talk, processing speed and vocabulary size in Spanish-learning children. , 2008, Developmental science.

[30]  Kjellrun T. Englund.  Voice onset time in infant directed speech over the first six months , 2005 .

[31]  L. Lisker,et al.  A Cross-Language Study of Voicing in Initial Stops: Acoustical Measurements , 1964 .

[32]  R. Jacobs,et al.  Perception of speech reflects optimal use of probabilistic speech cues , 2008, Cognition.

[33]  Donna M. Brinton,et al.  Teaching Pronunciation: A Reference for Teachers of English to Speakers of Other Languages , 1996 .

[34]  William D. Marslen-Wilson,et al.  Mechanisms of phonological inference in speech perception. , 1998, Journal of experimental psychology. Human perception and performance.

[35]  W. Marslen-Wilson,et al.  Mechanisms of phonological inference in speech perception. , 1998, Journal of experimental psychology. Human perception and performance.

[36]  D. Gow.  Assimilation and Anticipation in Continuous Spoken Word Recognition , 2001 .

[37]  Patricia K. Kuhl,et al.  Fast Track , 2020, Electric and Hybrid Vehicle Technology International.

[38]  W. Marslen-Wilson,et al.  The mental representation of lexical form: A phonological approach to the recognition lexicon , 1991, Cognition.

[39]  J. Ohala.  Papers in Laboratory Phonology: The phonetics and phonology of aspects of assimilation , 1990 .

[40]  L. Shockey,et al.  Phonological Processes in Speech Addressed to Children , 1980 .

[41]  Francisco Lacerda,et al.  Voice Onset Time in Speech to Infants and Adults , 1999, Phonetica.

[42]  E. Bard,et al.  The unintelligibility of speech to children: effects of referent availability , 1994, Journal of Child Language.

[43]  Keith Johnson.  Massive reduction in conversational American English , 2004 .

[44]  Bart de Boer,et al.  Investigating the role of infant-directed speech with a computer model , 2003 .

[45]  J. R. Landis,et al.  The measurement of observer agreement for categorical data. , 1977, Biometrics.

[46]  Nan Bernstein Ratner,et al.  Phonological rule usage in mother-child speech , 1984 .

[47]  Martin C. Barry,et al.  Palatalisation, assimilation and gestural weakening in connected speech , 1992, Speech Commun..

[48]  A. Fernald,et al.  Expanded Intonation Contours in Mothers' Speech to Newborns. , 1984 .

[49]  N. Ratner.  Patterns of vowel modification in mother–child speech , 1984, Journal of Child Language.

[50]  William J. Hardcastle,et al.  Categorical and gradient properties of assimilation in alveolar to velar sequences: evidence from EPG and EMA data , 2002, J. Phonetics.

[51]  J. Bernthal,et al.  Articulation and Phonological Disorders: Speech Sound Disorders in Children , 2012 .

[52]  Rebecca J. Panagos.  Meaningful Differences in the Everyday Experience of Young American Children , 1998 .

[53]  Toni Rietveld,et al.  Statistical Techniques for the Study of Language and Language Behaviour , 1993 .

[54]  Jane A. Baran,et al.  Phonological contrastivity in conversation: a comparative study of voice onset time , 1977 .