Hennequin A, Rochet-Capellan A, Gerber S, Dohen M. Does the Visual Channel Improve the Perception of Consonants Produced by Speakers of French With Down Syndrome?
JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2018;
61:957-972. [PMID:
29635399 DOI:
10.1044/2017_jslhr-h-17-0112]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 12/08/2017] [Indexed: 06/08/2023]
Abstract
PURPOSE
This work evaluates whether seeing the speaker's face could improve the speech intelligibility of adults with Down syndrome (DS). This is not straightforward because DS induces a number of anatomical and motor anomalies affecting the orofacial zone.
METHOD
A speech-in-noise perception test was used to evaluate the intelligibility of 16 consonants (Cs) produced in a vowel-consonant-vowel context (Vo = /a/) by 4 speakers with DS and 4 control speakers. Forty-eight naïve participants were asked to identify the stimuli in 3 modalities: auditory (A), visual (V), and auditory-visual (AV). The probability of correct responses was analyzed, as well as AV gain, confusions, and transmitted information as a function of modality and phonetic features.
RESULTS
The probability of correct response follows the trend AV > A > V, with smaller values for the DS than the control speakers in A and AV but not in V. This trend depended on the C: the V information particularly improved the transmission of place of articulation and to a lesser extent of manner, whereas voicing remained specifically altered in DS.
CONCLUSIONS
The results suggest that the V information is intact in the speech of people with DS and improves the perception of some phonetic features in Cs in a similar way as for control speakers. This result has implications for further studies, rehabilitation protocols, and specific training of caregivers.
SUPPLEMENTAL MATERIAL
https://doi.org/10.23641/asha.6002267.
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