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Laryngeal Constriction Phenomena in Infant Vocalizations.
Michael P Robb1,2, Faraz Yavarzadeh3, Philip J Schluter2,4
1Department of Communication Sciences and Disorders, Pennsylvania State University, University Park.
Journal of Speech, Language, and Hearing Research : JSLHR
|December 18, 2019
Summary
Laryngeal constrictions are common in infant vocalizations like crying and babbling. This study found these constrictions play a key role in early speech development and articulatory control.
Area of Science:
- Developmental linguistics
- Speech and hearing science
- Pediatric audiology
Background:
- Laryngeal constriction has been observed during infant vocal development.
- Understanding its role is crucial for infant speech acquisition.
Purpose of the Study:
- To investigate the developmental occurrence of laryngeal constriction phenomena in infant vocalizations.
- To analyze its presence in crying, cooing, and babbling.
Main Methods:
- Acoustic evaluation of approximately 20,000 vocalization samples from 20 healthy infants (1-7 months).
- Combined visual (frequency spectra, melody curves) and auditory analysis.
- Analysis of constriction occurrence across different vocalization types and age groups.
Main Results:
- Laryngeal constrictions were present in both cry and noncry vocalizations.
- Constriction frequency increased then decreased developmentally, peaking between 3-5 months.
- Constrictions occurred in 14%-22% of vocalizations during this peak period.
Conclusions:
- Laryngeal constriction is a regular phenomenon in healthy infant vocalizations.
- Infants utilize physiological constraints for articulatory development during vocal exploration.
- The larynx is the primary articulator controlled by infants in early phonetic skill development.
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