Correlation of individual differences in audiovisual asynchrony across stimuli and tasks: new constraints on Temporal Renormalization theory
| Autor: | Maayan Karlinski, Elliot D. Freeman, Alberta Ipser |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Adult
Male Speech perception Time Factors media_common.quotation_subject Illusion Individuality Experimental and Cognitive Psychology 050105 experimental psychology Task (project management) Correlation 03 medical and health sciences Behavioral Neuroscience Young Adult 0302 clinical medicine Arts and Humanities (miscellaneous) Perception Humans 0501 psychology and cognitive sciences Generalizability theory Set (psychology) media_common Mathematics Communication business.industry 05 social sciences Asynchrony (computer programming) Pattern Recognition Visual Speech Perception Female business Psychological Theory 030217 neurology & neurosurgery Cognitive psychology |
| ISSN: | 0096-1523 |
| Popis: | Sight and sound are out of synch in different people by different amounts for different tasks. But surprisingly, different concurrent measures of perceptual asynchrony correlate negatively (Freeman, Ipser et al, 2013. Cortex 49, 2875–2887): thus if vision subjectively leads audition in one individual, the same individual might show a visual lag in other measures of audiovisual integration (e.g. McGurk illusion, Stream-Bounce illusion).\ud \ud This curious negative correlation was first observed between explicit temporal order judgements and implicit phoneme identification tasks, performed concurrently as a dual task, using incongruent McGurk stimuli. Here we used a new set of different of explicit and implicit tasks and congruent stimuli, to test whether this negative correlation persists across testing sessions, and whether it might be an artefact of using specific incongruent stimuli. None of these manipulations eliminated the negative correlation between explicit and implicit measures. This supports the generalisability and validity of the phenomenon, and offers new theoretical insights into its explanation.\ud \ud Our previously proposed ‘temporal renormalization’ theory assumes that the timings of sensory events registered within the brain’s different multimodal sub-networks are each perceived relative to a representation of the typical average timing of such events across the wider network. Our new data suggest that this representation is stable and generic, rather than dependent on specific stimuli or task contexts, and that it may be acquired through experience with a variety of simultaneous stimuli. Our results also add further evidence that speech comprehension may be improved in some individuals by artificially delaying voices relative to lip-movements. |
| Databáze: | OpenAIRE |
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