ESCA Workshop on Audio-Visual Speech Processing (AVSP'97)
September 26-27, 1997
Dyslexic and control school students (mean age 13.5 years) were tested using a series of unimodal and bimodal speechtokens; ba,va,tha,da and ga in every combination and unimodally. They made significantly more errors than controls to unimodal auditory and unimodal visual tokens. Their integration of audiovisual speech was not significantly impaired, but it did show a different function than that of controls, reflecting the anomalous unimodal processing functions. These data fit recent suggestions that magnocellular function is impaired in dyslexia. They fit less easily both with auditory temporal processing deficit theories or with theories of defective phonemic processing . A general 'integration-deficit' theory (Paulesu etal, 1996) is not supported by these data.
Bibliographic reference. Campbell, Ruth / Whittingham, A. / Frith, U. / Massaro, Dominic W. / Cohen, M. M. (1997): "Audiovisual speech perception in dyslexics: impaired unimodal perception but no audiovisual integration deficit", In AVSP-1997, 85-88.