Luminance-evoked Inhibition in Primary Visual Cortex: a Transient Veto of Simultaneous and Ongoing Response.
From: Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
The Journal of neuroscience : the official journal of the Society for Neuroscience
- Publish Date: Dec 2006
- ISSN: 1529-2401
- Volume: 26
- Issue: 52
- Pages: 13537-47
- Medium: Internet
- Language: English
- Citation (JAMA): Tucker Thomas R, Fitzpatrick David, et al. Luminance-evoked Inhibition in Primary Visual Cortex: a Transient Veto of Simultaneous and Ongoing Response.. J. Neurosci. Dec 2006;26:13537-47
Abstract
Large-scale changes in luminance are known to exert a significant suppressive or masking effect on visual perception, but the neural substrate for this effect remains unclear. In this report, we describe the results of experiments using in vivo intracellular recording to explore the impact of luminance transients on the responses of orientation-selective neurons in layer 2/3 of tree shrew primary visual cortex. By measuring changes in excitatory and inhibitory conductances, we find that instantaneous changes in luminance evoke strong cortical inhibition. When combined with visual stimuli that would otherwise yield strong excitatory responses, luminance transients produce significant reductions in excitation as well as increases in inhibition. As a result, luminance transients significantly delay the emergence of orientation tuned cortical responses, and virtually eliminate ongoing responses to effective stimuli. We conclude that cortical inhibition is a critical factor in luminance-evoked cortical suppression and the likely substrate for luminance-induced visual masking phenomenon.
Mesh Headings (Keywords): Action Potentials, Animals, Evoked Potentials, Visual, Neural Inhibition, Neurons, Photic Stimulation, Phototransduction, Reaction Time, Tupaiidae, Visual Cortex
Check for Full Text / PubMed Unique Identifier (PMID): 17192437
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