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A Combination of Vocal f 0 Dynamic and Summary Features Discriminates between Three Pragmatic Categories of Infant‐Directed Speech
Author(s) -
Katz Gary S.,
Cohn Jeffrey F.,
Moore Christopher A.
Publication year - 1996
Publication title -
child development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.103
H-Index - 257
eISSN - 1467-8624
pISSN - 0009-3920
DOI - 10.1111/j.1467-8624.1996.tb01729.x
Subject(s) - speech recognition , duration (music) , psychology , standard deviation , audiology , computer science , pattern recognition (psychology) , artificial intelligence , cognitive psychology , statistics , mathematics , acoustics , medicine , physics
To assess the relative contribution of dynamic and summary features of vocal fundamental frequency (f 0 ) to the statistical discrimination of pragmatic categories in infant‐directed speech, 49 mothers were instructed to use their voice to get their 4‐month‐old baby's attention, show approval, and provide comfort. Vocal f 0 from 621 tokens was extracted using a Computerized Speech Laboratory and custom software. Dynamic features were measured with convergent methods (visual judgment and quantitative modeling of f 0 contour shape). Summary features were f 0 mean, standard deviation, and duration. Dynamic and summary features both individually and in combination statistically discriminated between each of the pragmatic categories. Classification rates were 69% and 62% in initial and cross‐validation DFAs, respectively.