Acoustic and perceptual evaluation of category goodness of /t/ and /k/ in typical and misarticulated child speech
(English)Manuscript (preprint) (Other academic)
The topic of the present investigation is the perceptual and acoustic nature of children’s successful and unsuccessful efforts at producing /t/ and /k/, with a specific aim at exploring perceptual sensitivity to phonetic detail, and the extent to which this sensitivity is reflected in the acoustic domain. Recordings were collected from children with a speech sound disorder (SSD), who misarticulated one of the target plosives. These recordings were compared to correct productions recorded from children with typical speech development (TD). Perceptual responses were registered with regards to a visual-analogue scale, ranging from “clear [t]” to “clear [k]”. Acoustic features were described by means of spectral moments and discrete cosine transformation analysis. The perceptual evaluation showed that “clear substitutions” of [t] for /k/, as well as of [k] for /t/, were rated as being less prototypical than correct productions. Hence, human listeners exhibit perceptual sensitivity to covert contrast. Moreover, even among target-appropriate productions of /t/ and /k/, items produced by children with SSD were rated as less prototypical than those produced by TD peers. Although both acoustic analysis methods discriminated between the gross categories /t/ and /k/, none of them exhibited the same sensitivity to phonetic detail as the human listeners.
IdentifiersURN: urn:nbn:se:kth:diva-143101OAI: oai:DiVA.org:kth-143101DiVA: diva2:705407
QS 20142014-03-172014-03-172014-03-17Bibliographically approved