Document Detail

No consistent relationship between gamma power and peak frequency in macaque primary visual cortex.
MedLine Citation:
PMID:  23283318     Owner:  NLM     Status:  MEDLINE    
Neural activity in the gamma frequency range ("gamma") is elevated during active cognitive states. Gamma has been proposed to play an important role in cortical function, although this is debated. Understanding what function gamma might fulfill requires a better understanding of its properties and the mechanisms that generate it. Gamma is characterized by its spectral power and peak frequency, and variations in both parameters have been associated with changes in behavioral performance. Modeling studies suggest these properties are co-modulated, but this has not been established. To test the relationship between these properties, we measured local field potentials (LFPs) and neuronal spiking responses in primary visual cortex of anesthetized monkeys, for drifting sinusoidal gratings of different sizes, contrasts, orientations and masked with different levels of noise. We find that there is no fixed relationship between LFP gamma power and peak frequency, and neither is related to the strength of spiking activity. We propose a simple model that can account for the complex stimulus dependence we observe, and suggest that separate mechanisms determine gamma power and peak frequency.
Xiaoxuan Jia; Dajun Xing; Adam Kohn
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  33     ISSN:  1529-2401     ISO Abbreviation:  J. Neurosci.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-03     Completed Date:  2013-03-12     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  17-25     Citation Subset:  IM    
Dominick Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
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MeSH Terms
Action Potentials / physiology*
Evoked Potentials, Visual / physiology*
Macaca fascicularis
Neurons / physiology*
Orientation / physiology
Photic Stimulation
Visual Cortex / physiology*
Visual Perception / physiology*
Grant Support

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