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Differences in infants' vocalization patterns across home and laboratory recordings were examined. Audiorecordings of the infants were made in both environments during the month immediately following the observed onset of speech-like (canonical) syllables. Analyses indicated that: (a) infants produced more vocalizations per minute in the home than in the laboratory, (b) the vocalizations in the home included higher proportions of speech-like syllables than the vocalizations in the laboratory did, and (c) the vocalizations in the two environments had similar phonetic characteristics. These findings suggest that, while infants' vocalization patterns can be affected by the surrounding environment, the phonetic characteristics of their utterances do not show wide variation.
Lewedag et al. (Sat,) studied this question.