Brief prior exposure to mismatched audio-visual speech reduces later visual weight in fusion.

Evidence

Nahorna et al. ( 2012 , 2015 ) showed that the McGurk effect can be significantly and strongly reduced by an audiovisual context made of a few seconds of incoherent material (sounds and images coming from different speech sources) presented before the McGurk target (audio “ba” plus video “ga”): the target, classically perceived as “da” in the McGurk effect, was more often perceived as “ba”, suggesting a decreased weight of the visual input in the fusion process. … The interpretation was that the incoherent context resulted in an “unbinding” effect decreasing the visual weight and hence diminishing the McGurk effect. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5138

Categorization

• QUESTION: What is the time course and persistence of this unbinding effect beyond a few seconds of context?
• XREF: Relates directly to the hearing-in-noise goal: visual weight modulation matters for speech intelligibility in competing scenes.