Abstract:The duration of three infants' vocalisations were examined during a six-month longitudinal study. In contrast to most other infant research, this study included in its analysis all vocalisations including those deemed vegetative or those having nonmodal voice quality. All three infants produced vocalisations which decreased in duration in the initial months. However between the 3rd and 5th month a significant increase (p<0.001) in the duration of vocalisations was found (from mean 207ms to 431ms). When vocalis… Show more
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