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Multisensory simultaneity judgment and proximity to the body
Journal of Vision
|February 20, 2016
Summary
Multisensory integration is influenced by space and time. Audiovisual simultaneity windows are larger in near-body space, suggesting body-centered processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychophysics
Background:
- Multisensory integration relies on stimulus statistical properties like spatial and temporal proximity.
- The simultaneity window (SW) describes the temporal range for judging multisensory events as co-occurring.
- Peripersonal space (PPS) is a body-centered region where external stimuli are jointly processed with bodily events.
Purpose of the Study:
- To investigate the interplay between temporal and spatial dimensions of multisensory representation.
- To measure the audiovisual simultaneity window (SW) across peripersonal space (PPS) and extrapersonal space.
Main Methods:
- Psychophysical measurement of audiovisual simultaneity windows (SWs).
- Comparison of SWs within peripersonal space (PPS) versus extrapersonal space.
Main Results:
- Audiovisual SWs were significantly larger within PPS compared to outside PPS.
- This expansion of the SW within PPS suggests enhanced multisensory processing near the body.
Conclusions:
- The spatial dimension, specifically peripersonal space (PPS), modulates temporal aspects of multisensory integration.
- This effect is likely driven by automatic, body-centered computations within a distinct reference frame.
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