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Multisensory cortical processing of object shape and its relation to mental imagery
Minming Zhang1, Valerie D Weisser, Randall Stilla
1Department of Neurology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Cognitive, Affective & Behavioral Neuroscience
|October 6, 2004
Summary
This study reveals how the brain processes object shape using both vision and touch. Visual imagery during touch perception activates specific visual brain regions, particularly in the right hemisphere.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- The human brain integrates information from different senses to perceive objects.
- Understanding how visual and haptic (touch) shape perception interact is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate multisensory shape processing in the human cerebral cortex using functional magnetic resonance imaging (fMRI).
- To explore the role of mental imagery in visual and haptic shape perception.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to observe brain activity.
- Participants engaged in visual and haptic shape perception tasks, contrasted with texture perception.
Main Results:
- Bimodal regions, including the superior parietal gyrus, anterior intraparietal sulcus, and lateral occipital complex, showed activity for both visual and haptic shape perception.
- Parietal areas showed a preference for haptic stimuli, while the lateral occipital complex preferred visual stimuli.
- Visual imagery during haptic perception was common and correlated with activity in the right lateral occipital complex.
Conclusions:
- Specific brain regions, notably the lateral occipital complex and parietal areas, are involved in multisensory shape processing.
- Visual mental imagery plays a role in activating visual cortical areas during haptic shape perception, especially in the right hemisphere.