Abstract
The McGurk effect is a classic audiovisual speech illusion in which discrepant auditory and visual syllables can lead to a fused percept (e.g., an auditory /bɑ/ paired with a visual /gɑ/ often leads to the perception of /dɑ/). The McGurk effect is robust and easily replicated in pooled group data, but there is tremendous variability in the extent to which individual participants are susceptible to it. In some studies, the rate at which individuals report fusion responses ranges from 0% to 100%. Despite its widespread use in the audiovisual speech perception literature, the roots of the wide variability in McGurk susceptibility are largely unknown. This study evaluated whether several perceptual and cognitive traits are related to McGurk susceptibility through correlational analyses and mixed effects modeling. We found that an individual’s susceptibility to the McGurk effect was related to their ability to extract place of articulation information from the visual signal (i.e., a more fine-grained analysis of lipreading ability), but not to scores on tasks measuring attentional control, processing speed, working memory capacity, or auditory perceptual gradiency. These results provide support for the claim that a small amount of the variability in susceptibility to the McGurk effect is attributable to lipreading skill. In contrast, cognitive and perceptual abilities that are commonly used predictors in individual differences studies do not appear to underlie susceptibility to the McGurk effect.
Highlights
A speaking face provides listeners with both auditory and visual information
McGurk susceptibility (MGS) ranged from a 0% fusion rate to a 99% fusion rate (Fig 1), suggesting that our measure of MGS accurately captured the range of values that have been reported in numerous other experiments
This experiment served as the first large-scale correlational study of the relationship between MGS and multiple cognitive and perceptual abilities that are prevalent in the speech perception literature
Summary
Among the most well-documented phenomena in the speech perception literature is the finding that listeners are more successful at understanding speech when they can see and hear the talker, relative to hearing alone [1,2,3,4,5]. Another commonly cited demonstration of the influence of the visual modality on speech perception is the McGurk effect, which occurs when discrepant auditory and visual stimuli result in the perception of a stimulus that was not present in either individual modality [6]. The McGurk effect is a remarkably robust illusion—it occurs when the voice and the face are mismatching genders [7], when the face is represented by a point-light display [8], when listeners are told to focus
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