Local Temporal Regularities in Child-Directed Speech in Spanish

Author:

Pérez-Navarro Jose12ORCID,Lallier Marie1ORCID,Clark Catherine12ORCID,Flanagan Sheila3,Goswami Usha3ORCID

Affiliation:

1. BCBL, Basque Center on Cognition, Brain and Language, Donostia-San Sebastián, Spain

2. University of the Basque Country UPV/EHU, Donostia-San Sebastián, Spain

3. Centre for Neuroscience in Education, Department of Psychology, University of Cambridge, United Kingdom

Abstract

Purpose: The purpose of this study is to characterize the local (utterance-level) temporal regularities of child-directed speech (CDS) that might facilitate phonological development in Spanish, classically termed a syllable-timed language. Method: Eighteen female adults addressed their 4-year-old children versus other adults spontaneously and also read aloud (CDS vs. adult-directed speech [ADS]). We compared CDS and ADS speech productions using a spectrotemporal model (Leong & Goswami, 2015), obtaining three temporal metrics: (a) distribution of modulation energy, (b) temporal regularity of stressed syllables, and (c) syllable rate. Results: CDS was characterized by (a) significantly greater modulation energy in the lower frequencies (0.5–4 Hz), (b) more regular rhythmic occurrence of stressed syllables, and (c) a slower syllable rate than ADS, across both spontaneous and read conditions. Discussion: CDS is characterized by a robust local temporal organization (i.e., within utterances) with amplitude modulation bands aligning with delta and theta electrophysiological frequency bands, respectively, showing greater phase synchronization than in ADS, facilitating parsing of stress units and syllables. These temporal regularities, together with the slower rate of production of CDS, might support the automatic extraction of phonological units in speech and hence support the phonological development of children. Supplemental Material: https://doi.org/10.23641/asha.21210893

Publisher

American Speech Language Hearing Association

Subject

Speech and Hearing,Linguistics and Language,Language and Linguistics

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