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Published on: July 1, 2015
Vocalization and breathing during the first year of life
C A Boliek1, T J Hixon, P J Watson
1National Center for Neurogenic Communication Disorders, University of Arizona, Tucson 85721, USA.
Insights
Infant breathing patterns vary significantly during vocalizations like cries and grunts. This variability, influenced by age and body size, is crucial for understanding early vocal development in babies.
Area of Science:
- Developmental biology
- Pediatrics
- Speech and hearing science
Background:
- Infant vocalizations and breathing are complex, coordinated processes.
- Understanding the interplay between respiration and vocalization is key to infant development.
- Limited research exists on the natural course of these behaviors in the first year of life.
Purpose of the Study:
- To investigate the relationship between vocalization types and breathing patterns in healthy infants.
- To analyze how age, body length, and position influence infant breathing during vocalization.
- To establish a protocol for observing the emergence of vocalization and breathing in early infancy.
Main Methods:
- Studied 40 healthy infants aged 5 weeks to 12 months.
- Monitored breathing using variable inductance plethysmography to measure rib cage, abdomen, and lung volume changes.
- Analyzed four vocalization types: cries, whimpers, grunts, and syllable utterances.
Main Results:
- Breathing behavior exhibited high variability across different vocalization types.
- Infant breathing patterns were influenced by body length, body position, and age.
- No significant influence of vocalization type or sex on breathing behavior was observed.
- Breathing variability demonstrates infants' adaptable aeromechanical drive for vocal production.
Conclusions:
- Infant breathing patterns are dynamic and adaptable during vocalizations.
- Age, body length, and position are key factors modulating infant respiratory behavior.
- The established protocol effectively tracks the natural development of infant vocalization and breathing.
Abstract:
Vocalization and breathing were studied in 40 healthy infants, including five boys and five girls each at ages 5 weeks, 2.5 months, 6.5 months, and 12 months. Breathing was monitored through the use of a variable inductance plethysmograph that enabled estimates of the volume changes of the rib cage, abdomen, and lung, as well as estimates of selected temporal features of the breathing cycle. Four vocalization types were studied intensively. These included cries, whimpers, grunts, and syllable utterances. Breathing behavior was highly variable across the four vocalization types, demonstrating the degrees of freedom of performance available to the infant to accomplish the aeromechanical drive required. Such behavior was influenced by body length, body position, and age, but not by vocalization type and sex. The protocol established is a useful tool for observing the natural course of the emergence of vocalization and breathing during the first year of life.
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