Audiovisual Speech Perception in Children With Developmental Language Disorder in Degraded Listening Conditions PurposeThe effect of the signal-to-noise ratio (SNR) on the perception of audiovisual speech in children with and without developmental language disorder (DLD) was investigated by varying the noise level and the sound intensity of acoustic speech. The main hypotheses were that the McGurk effect (in which incongruent visual speech alters ... Article
Article  |   February 01, 2013
Audiovisual Speech Perception in Children With Developmental Language Disorder in Degraded Listening Conditions
 
Author Affiliations & Notes
  • Auli Meronen
    Niilo Mäki Institute, University of Jyväskylä, Finland
  • Kaisa Tiippana
    Institute of Behavioural Sciences (Psychology), University of Helsinki, Finland
  • Jari Westerholm
    Niilo Mäki Institute, University of Jyväskylä, Finland
  • Timo Ahonen
    University of Jyväskylä, Finland
  • Correspondence to Auli Meronen: auli.meronen@elisanet.fi
  • Editor: Janna Oetting
    Editor: Janna Oetting×
  • Associate Editor: Marc Joanisse
    Associate Editor: Marc Joanisse×
Article Information
Hearing & Speech Perception / Acoustics / Language Disorders / Language
Article   |   February 01, 2013
Audiovisual Speech Perception in Children With Developmental Language Disorder in Degraded Listening Conditions
Journal of Speech, Language, and Hearing Research, February 2013, Vol. 56, 211-221. doi:10.1044/1092-4388(2012/11-0270)
History: Received October 4, 2011 , Accepted May 16, 2012
 
Journal of Speech, Language, and Hearing Research, February 2013, Vol. 56, 211-221. doi:10.1044/1092-4388(2012/11-0270)
History: Received October 4, 2011; Accepted May 16, 2012
Web of Science® Times Cited: 12

PurposeThe effect of the signal-to-noise ratio (SNR) on the perception of audiovisual speech in children with and without developmental language disorder (DLD) was investigated by varying the noise level and the sound intensity of acoustic speech. The main hypotheses were that the McGurk effect (in which incongruent visual speech alters the auditory speech percept) would be weaker for children with DLD than for controls and that it would get stronger with decreasing SNR in both groups.

MethodThe participants were 8-year-old children with DLD and a sample of children with normal language development. In the McGurk stimuli, the consonant uttered by the voice differed from that articulated by the face. Three sound intensities (24, 36, and 48 dB) and noise levels (−12, 0, and +6 dB) were used. Perception of unisensory visual speech was also measured.

ResultsThe children with DLD experienced a weak McGurk effect, that is, a weak influence of visual speech on audiovisual speech perception, which remained rather constant across SNR levels. The children with DLD were inaccurate at lipreading.

ConclusionsChildren with DLD have problems in perceiving spoken consonants presented audiovisually and visually. The weaker McGurk effect could be accounted for by the poorer lipreading ability of children with DLD.

Acknowledgments
We thank Mikko Sams from Aalto University for providing access to the software code and stimuli and Tapani Suihkonen from Aalto University for modifying the stimuli. We also thank the children who participated in this study, their families, and the personnel of the participating schools.
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