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Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
Published on: December 8, 2023
Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex
Gilles Pourtois1, Sophie Schwartz, Mona Spiridon
1Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience and Clinic of Neurology, Ghent University, Henri Dunantlaan 2, 9000 Gent, Belgium. gilles.pourtois@ugent.be
Cerebral Cortex (New York, N.Y. : 1991)
|November 19, 2008
Summary
Visual object recognition can be viewpoint-independent, relying on common brain regions like the LOC and medial FG. These areas process multiple object categories regardless of viewpoint or size changes.
Area of Science:
- Neuroscience
- Cognitive Science
- Visual Perception
Background:
- Understanding how the brain recognizes objects despite changes in viewpoint is crucial for visual perception.
- It remains unclear if distinct brain regions in the extrastriate visual cortex process different object categories invariantly.
Purpose of the Study:
- To investigate whether neural processes for view-invariant object recognition involve distinct extrastriate visual cortex subregions for different object categories.
- To map visual cortical areas involved in maintaining object representations across viewpoint changes.
Main Methods:
- Used event-related functional magnetic resonance imaging (fMRI) in 16 healthy volunteers.
- Presented exemplars from three categories (faces, houses, chairs) twice with varying time lags.
- Varied object viewpoint and retinal size during stimulus repetition to identify adaptation effects.
Main Results:
- Object-selective adaptation effects partially overlapped with category-selective regions (FG for faces, parahippocampal gyrus for houses, LOC for chairs).
- Face-selective FG showed viewpoint-dependent adaptation; medial FG showed viewpoint- and size-independent repetition effects for faces and other objects.
- Bilateral LOC exhibited category- and viewpoint-independent repetition effects.
Conclusions:
- Revealed a common neural substrate in bilateral LOC and right medial FG for view-invariant and category-independent object recognition.
- Medial FG shows a relative preference for faces, while LOC demonstrates no category selectivity.
- These findings contribute to understanding the neural basis of object recognition across varying visual conditions.
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