This article is part of the Research Topic Brain oscillations and behavior.

Original Research ARTICLE

Front. Integr. Neurosci., 07 July 2009 | doi: 10.3389/neuro.07.015.2009

Modulation of gamma-band activity across local cortical circuits

Center for Neuroscience, University of California, Davis, CA, USA
Periodic activity patterns or oscillations within the gamma frequency band (20–80 Hz) have been implicated in sensory processing and cognition in many areas of the cerebral cortex, including primary visual cortex (V1). Although periodic activity appears to be a hallmark of cortical neurons, little is known about the dynamics of these activity patterns as signals progress within local cortical circuits. This study compares the strength of periodic activity between neurons in the input and output stages of cortical processing – neurons in layers 4 and 6 – of V1 in the alert macaque monkey. Our results demonstrate that while both populations of neurons display significant gamma-band activity, this activity increases from the input to output layers of the cortex. These data suggest that local cortical circuits enhance periodic activity within a cortical area.
V1, LGN, geniculocortical, corticogeniculate
Briggs F and Usrey WM (2009). Modulation of gamma-band activity across local cortical circuits. Front. Integr. Neurosci. 3:15. doi: 10.3389/neuro.07.015.2009
15 March 2009;
 Paper pending published:
16 April 2009;
09 June 2009;
 Published online:
07 July 2009.

Edited by:

Rui M. Costa, Instituto Gulbenkian de Ciência, Portugal

Reviewed by:

Jose-Manuel Alonso, Sociedad Espanola de Neurociencia, Spain
Gordon Pipa, Max Planck Institute for Brain Research, Germany
© 2009 Briggs and Usrey. This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.
W. Martin Usrey, Center for Neuroscience, University of California, Davis, 1544 Newton Court, Davis, CA 95618, USA. e-mail:
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