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Related Experiment Video

Updated: Feb 14, 2026

Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication

Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication

Published on: June 5, 2016

Utterance Duration as It Relates to Communicative Variables in Infant Vocal Development.

Heather L Ramsdell-Hudock¹, Andrew Stuart², Douglas F Parham³

¹Idaho State University, Pocatello.

Journal of Speech, Language, and Hearing Research : JSLHR

|February 8, 2018

Summary

Infant utterance duration changes significantly with age, vocalization type, facial affect, and gaze. Utterances become more consistent after 12 months, coinciding with early word development.

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Published on: August 8, 2011

Area of Science:

Developmental linguistics
Infant communication
Speech acoustics

Background:

Understanding infant vocalizations is crucial for tracking developmental milestones.
Previous research has explored various aspects of infant communication, but the interplay of utterance duration with multiple contextual factors requires further investigation.

Purpose of the Study:

To investigate how utterance duration in prelinguistic/early linguistic infants relates to vocal type, facial affect, gaze direction, and age.
To provide novel insights into the developmental trajectory of infant vocalizations.

Main Methods:

Longitudinal analysis of 18,236 infant utterances from 15 infants aged 8 to 16 months.
Measurement of utterance durations and coding for vocal type, facial affect, and gaze direction.

Main Results:

Infant utterance durations showed significant changes across development, being shortest at 14 months and longest at 16 months.
Statistically significant variations in utterance duration were observed in relation to vocal type, facial affect, and gaze direction.

Conclusions:

Infant utterance durations exhibit developmental patterns, becoming more consolidated after the first year of life.
The age of 12 months may represent a critical period when utterance durations start to align with communicative variables, potentially preceding first word acquisition.