Neuropsychological studies of auditory-visual fusion illusions. Four case studies and their implications

Ruth Campbell*, Jeanette Garwood, Sue Franklin, David Howard, Theodore Landis, Marianne Regard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

A heard speech sound which is not the same as the synchronized seen speech sound can sometimes give rise to an illusory phonological percept. Typically, a heard /ba/ combines with a seen /ga/ to give the impression that /da/ has been heard (MCGURK, H. and MACDONALD, J. Nature Lond. 264, 746-748, 1976). We report the susceptibility to this illusion of four individuals with localized brain lesions affecting perceptual function. We compare their performance to that of ten control subjects and relate these findings to the efficiency of processinf seen and heard speech in separate and combined modalities. The pattern of performance strongly suggests LH specialization for the phonological integration of seen and heard speech. The putative site of such integration can be effectively isolated from unilateral and from bilateral inputs and may be driven by either modality.

Original languageEnglish
Pages (from-to)787-802
Number of pages16
JournalNeuropsychologia
Volume28
Issue number8
DOIs
Publication statusPublished - 1990
Externally publishedYes

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