1. Varieties of perceptual instability and their neural correlates.
- Author
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Ishizu, Tomohiro and Zeki, Semir
- Subjects
- *
NEURAL circuitry , *MAGNETIC resonance imaging of the brain , *BRAIN imaging , *MEDICAL imaging systems , *FACE , *VISUALIZATION , *FUNCTIONAL magnetic resonance imaging , *PHYSIOLOGY - Abstract
Abstract: We report experiments designed to learn whether different kinds of perceptually unstable visual images engage different neural mechanisms. 21 subjects viewed two types of bi-stable images while we scanned the activity in their brains with functional magnetic resonance imaging (fMRI); in one (intra-categorical type) the two percepts remained within the same category (e.g. face–face) while in the other (cross-categorical type) they crossed categorical boundaries (e.g. face–body). The results showed that cross- and intra-categorical reversals share a common reversal-related neural circuitry, which includes fronto-parietal cortex and primary visual cortex (area V1). Cross-categorical reversals alone engaged additional areas, notably anterior cingulate cortex and superior temporal gyrus, which have been posited to be involved in conflict resolution. [Copyright &y& Elsevier]
- Published
- 2014
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