If prosodic words are the principle units of speech planning and production, then the production of an unstressed grammatical word should be especially influenced by the adjacent context word with which it is chunked. The current study tested this prediction in child and adult speech to investigate the development of the speech plan. Anticipatory and perseveratory influences on determiner vowel production were investigated in simple SVO sentences produced by 5-year-old children and college-aged adults. Although children’s productions indicated greater perseveratory influences than adults’ productions, anticipatory effects were consistently stronger than perseveratory effects across age groups. The results suggest that, by age 5 years, children chunk determiners along morphosyntactic boundaries just like adults.
A noninvasive method for accurately measuring anticipatory coarticulation at experimentally defined temporal locations is introduced. The method leverages work in audiovisual (AV) speech perception to provide a synthetic and robust measure that can be used to inform psycholinguistic theory. In this validation study, speakers were audio-video recorded while producing simple subject-verb-object sentences with contrasting object noun rhymes. Coarticulatory resistance of target noun onsets was manipulated as was metrical context for the determiner that modified the noun. Individual sentences were then gated from the verb to sentence end at segmental landmarks. These stimuli were presented to perceivers who were tasked with guessing the sentence-final rhyme. An audio-only condition was included to estimate the contribution of visual information to perceivers' performance. Findings were that perceivers accurately identified rhymes earlier in the AV condition than in the audio-only condition (i.e., at determiner onset vs determiner vowel). Effects of coarticulatory resistance and metrical context were similar across conditions and consistent with previous work on coarticulation. These findings were further validated with acoustic measurement of the determiner vowel and a cumulative video-based measure of perioral movement. Overall, gated AV speech perception can be used to test specific hypotheses regarding coarticulatory scope and strength in running speech. V
Adults' narratives are hierarchically structured. This structure is evident in the linguistic and prosodic domains. Children's narratives have a flatter structure. This structure is evident in the linguistic domain, but less is known about the prosodic domain. Here, we report results from a longitudinal study of children's narratives that enhance our understanding of the development of discourse prosody. Spontaneous narratives were obtained from 60 children (aged 5 to 7) over a 3-year period. F0 was tracked to obtain absolute measures of slope steepness and linearity for every utterance of each narrative. These measures are known correlates of syntactic and semantic complexity. Slope direction and inter-utterance continuity in F0 were also calculated. These measures are known correlates of event boundaries in adult discourse. The results indicated systematic developmental changes related to age and year for all measures except slope steepness, consistent with developmental increases in linguistic complexity and the production of more adult-like narratives. The evidence also indicates that developmental change is most pronounced between the ages of 5 and 7 years, and levels out afterwards.
Purpose: This study used a cross-sequential design to identify developmental changes in narrative speech rhythm and intonation. The aim was to provide a robust, clinically relevant characterization of normative changes in speech prosody across the early school-age years. Method: Structured spontaneous narratives were elicited annually from 60 children over a 3-year period. Children were aged 5–7 years at study outset and then were aged 7–9 years at study offset. Articulation rate, prominence spacing, and intonational phrase length and duration were calculated for each narrative to index speech rhythm; measures of pitch variability and pitch range indexed intonation. Linear mixed-effects (LME) models tested for cohort-based and within-subject longitudinal change on the prosodic measures; linear regression was used to test for the simple effect of age-in-months within year on the measures. Results: The LME analyses indicated systematic longitudinal changes in speech rhythm across all measures except phrase duration; there were no longitudinal changes in pitch variability or pitch range across the school-age years. Linear regression results showed an increase in articulation rate with age; there were no systematic differences between age cohorts across years in the study. Conclusions: The results indicate that speech rhythm continues to develop during the school-age years. The results also underscore the very strong relationship between the rate and rhythm characteristics of speech and so suggest an important influence of speech motor skills on rhythm production. Finally, the results on pitch variability and pitch range are interpreted to suggest that these are inadequate measures of typical intonation development during the school-age years.
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