Presented five-month olds in English-speaking families with approval and prohibition vocalizations in infant-directed (ID) and adult-directed (AD) English, and in ID German, Italian, Japanese, and nonsense English. Infants responded differently to ID approval and disapproval in all languages except Japanese. Differential responses to approval and…

Compares the prosodic modifications in mothers' and fathers' speech to preverbal infants in American and British English, French, German, Japanese, and Italian. Speech samples were instrumentally analyzed to measure mean fundamental frequency, variability, utterance, duration, and pause duration. (67 references) (Author/CB)