Differences in gamma frequencies across visual cortex restrict their possible use in computation

Neuronal oscillations in the gamma band (30-80 Hz) have been suggested to play a central role in feature binding or establishing channels for neural communication. For these functions, the gamma rhythm frequency must be consistent across neural assemblies encoding the features of a stimulus. Here we...

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Veröffentlicht in:Neuron (Cambridge, Mass.) Jg. 67; H. 5; S. 885
Hauptverfasser: Ray, Supratim, Maunsell, John H R
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States 09.09.2010
Schlagworte:
Action Potentials - physiology
Animals
Brain Mapping
Contrast Sensitivity - physiology
Electroencephalography
Entropy
Evoked Potentials, Visual - physiology
Eye Movements - physiology
Macaca mulatta
Male
Neurons - physiology
Numerical Analysis, Computer-Assisted
Pattern Recognition, Visual - physiology
Photic Stimulation - methods
Time Factors
Visual Cortex - cytology
Visual Cortex - physiology
Visual Pathways - physiology
Wakefulness
ISSN:1097-4199, 1097-4199
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Zusammenfassung:Neuronal oscillations in the gamma band (30-80 Hz) have been suggested to play a central role in feature binding or establishing channels for neural communication. For these functions, the gamma rhythm frequency must be consistent across neural assemblies encoding the features of a stimulus. Here we test the dependence of gamma frequency on stimulus contrast in V1 cortex of awake behaving macaques and show that gamma frequency increases monotonically with contrast. Changes in stimulus contrast over time leads to a reliable gamma frequency modulation on a fast timescale. Further, large stimuli whose contrast varies across space generate gamma rhythms at significantly different frequencies in simultaneously recorded neuronal assemblies separated by as little as 400 microm, making the gamma rhythm a poor candidate for binding or communication, at least in V1. Instead, our results suggest that the gamma rhythm arises from local interactions between excitation and inhibition.
Bibliographie:ObjectType-Article-1
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ISSN:1097-4199
1097-4199
DOI:10.1016/j.neuron.2010.08.004