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The Measurement and Treatment of Suppression in Amblyopia
Published on: December 14, 2012
Modulation of sensory suppression: implications for receptive field sizes in the human visual cortex
S Kastner1, P De Weerd, M A Pinsk
1Department of Psychology, Center for the Study of Brain, Mind and Behavior, Princeton University, Princeton, NJ 08544, USA. skastner@princeton.edu
Journal of Neurophysiology
|September 6, 2001
Summary
Multiple visual stimuli compete for neural representation, causing suppressive interactions in human visual cortex. These interactions, observed in both ventral and dorsal areas, are scaled by neuronal receptive field sizes.
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Neuroscience
Background:
- Simultaneous visual stimuli interact and suppress each other, competing for neural representation.
- Previous studies showed this in ventral visual areas (V1, V2, V4, TEO) using fMRI.
- Suppressing interactions were also observed in dorsal visual areas (V3A, MT).
Purpose of the Study:
- To investigate suppressive interactions in dorsal visual areas (V3A, MT).
- To compare these interactions with those in ventral areas (V1-TEO).
- To determine if suppressive interactions scale with neuronal receptive field sizes.
Main Methods:
- Used functional magnetic resonance imaging (fMRI) to measure brain activity.
- Compared fMRI signals for simultaneously versus sequentially presented stimuli.
- Controlled for transient onsets and attentional cueing.
- Varied spatial separation of stimuli to estimate receptive field sizes.
Main Results:
- Suppressing interactions were confirmed in dorsal areas V3A and MT.
- fMRI responses were smaller for simultaneous stimuli than sequential ones.
- Receptive field size estimates in human visual cortex aligned with monkey studies.
- Suppressing interactions were found to be scaled by receptive field sizes.
Conclusions:
- Visual stimuli compete for neural representation across multiple cortical areas.
- Suppressing interactions are a fundamental mechanism in visual processing.
- Receptive field size is a key factor modulating these suppressive interactions.
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