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J Audiol Otol. 2019 Jan;23(1):39-48. English. Original Article. https://doi.org/10.7874/jao.2018.00234
Devaraju DS , U AK , Maruthy S .
Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysuru, Karnataka, India. dhatri2612@gmail.com
Department of Speech-Language Sciences, All India Institute of Speech and Hearing, Manasagangothri, Mysuru, Karnataka, India.
Abstract

Background and Objectives

The influence of visual stimulus on the auditory component in the perception of auditory-visual (AV) consonant-vowel syllables has been demonstrated in different languages. Inherent properties of unimodal stimuli are known to modulate AV integration. The present study investigated how the amount of McGurk effect (an outcome of AV integration) varies across three different consonant combinations in Kannada language. The importance of unimodal syllable identification on the amount of McGurk effect was also seen.

Subjects and Methods

Twenty-eight individuals performed an AV identification task with ba/ ga, pa/ka and ma/n· a consonant combinations in AV congruent, AV incongruent (McGurk combination), audio alone and visual alone condition. Cluster analysis was performed using the identification scores for the incongruent stimuli, to classify the individuals into two groups; one with high and the other with low McGurk scores. The differences in the audio alone and visual alone scores between these groups were compared.

Results

The results showed significantly higher McGurk scores for ma/n· a compared to ba/ga and pa/ka combinations in both high and low McGurk score groups. No significant difference was noted between ba/ga and pa/ka combinations in either group. Identification of /n· a/ presented in the visual alone condition correlated negatively with the higher McGurk scores.

Conclusions

The results suggest that the final percept following the AV integration is not exclusively explained by the unimodal identification of the syllables. But there are other factors which may also contribute to making inferences about the final percept.

Copyright © 2019. Korean Association of Medical Journal Editors.