Communicative functions of pitch range and pitch direction in infants

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Abstract
The communicative functions of pitch direction and pitch range during the second year were investigated. The research focusses on initial plus repeated requests, either for objects or for co-operation, which were contrasted against giving, showing and labelling. Infants aged 1; 2 to 1;10 were observed in interaction with their mothers in a semistructured situation. Vocalizations were coded separately for communicative function and for prosodic features. Results show that pitch range is consistently higher (1) for repeated requests than for initial requests for objects and (2) for initial requests for objects and for co-operation than for labelling. Giving and showing have an intermediate rank between requests and labelling. Trends in prosodic contours were observed in both requests and labelling: rising tones were more frequently associated with requests whereas falling tones appeared more often in conjunction with labelling.

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