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Neural mechanisms underlying sound-induced visual motion perception: An fMRI study
Souta Hidaka1, Satomi Higuchi2, Wataru Teramoto3
1Department of Psychology, Rikkyo University, 1-2-26, Kitano, Niiza-shi, Saitama 352-8558, Japan.
Acta Psychologica
|June 11, 2017
Summary
Sound can create the illusion of visual motion. This study found that auditory-induced visual motion (SIVM) and visually-induced visual apparent motion (VIVM) share brain activity but SIVM also engages auditory areas more, suggesting distinct neural mechanisms.
Area of Science:
- Neuroscience
- Cognitive Science
- Sensory Perception
Background:
- Crossmodal interactions in motion perception involve brain areas for motion processing and sensory association.
- Sound-induced visual motion (SIVM) is an illusion where sounds trigger perceived motion in static visual stimuli.
- Investigating the neural basis of SIVM is crucial for understanding multisensory integration.
Purpose of the Study:
- To investigate the brain activity patterns associated with sound-induced visual motion (SIVM).
- To compare neural activity in SIVM with visually-induced visual apparent motion (VIVM).
- To elucidate the neural mechanisms underlying crossmodal motion perception.
Main Methods:
- Utilized 7T functional magnetic resonance imaging (fMRI) to examine brain activity.
- Presented participants with SIVM and VIVM stimuli.
- Analyzed patterns of neural activation and functional connectivity.
Main Results:
- Shared activation in the middle occipital area (V5/hMT) for both SIVM and VIVM.
- SIVM showed greater activation in the superior temporal area compared to VIVM.
- Enhanced functional connectivity between V5/hMT and auditory/crossmodal motion areas during SIVM.
Conclusions:
- Neural mechanisms for SIVM and VIVM are similar yet partially distinct.
- Auditory and visual motion processing areas interact closely in SIVM perception.
- Findings highlight the intricate interplay of neural signals in crossmodal motion perception.
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