August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Image discontinuity changes LFP gamma-band activity in primary visual cortex V1
Author Affiliations
  • Dajun Xing
    Center for Neural Science, New York University
  • Chun-I Yeh
    Center for Neural Science, New York University
  • Patrick Williams
    Center for Neural Science, New York University
  • Andy Henrie
    Center for Neural Science, New York University
  • Robert Shapley
    Center for Neural Science, New York University
Journal of Vision August 2009, Vol.9, 753. doi:10.1167/9.8.753
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      Dajun Xing, Chun-I Yeh, Patrick Williams, Andy Henrie, Robert Shapley; Image discontinuity changes LFP gamma-band activity in primary visual cortex V1. Journal of Vision 2009;9(8):753. doi: 10.1167/9.8.753.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

In V1 cortex, large continuous visual stimuli suppress neurons' firing rates and power in the local field potential (LFP) spectrum [[gt]] 70 Hz. However, the spectral peak of LFP power in the gamma-band (around 50 Hz) often increases with stimulus size (Bauer et al., 1995; Henrie et al., 2006). This differential effect of stimulus size on the gamma-band peak could be explained if 1) gamma-band activity represents local neuronal activity, which is more synchronized by large stimuli (Gail et al., 2000) or 2) gamma-band activity represents neuronal activity in a large area of the cortex and grows stronger when more V1 neurons are activated by large stimuli. To decide between 1 and 2, we studied LFP responses to visual stimuli with or without spatial discontinuities.

LFPs were recorded in response to a large-area (8 deg radius) sinusoidal grating centered on receptive fields of neurons at the recording site. We also measured gamma-band coherence between different recording sites. Spatial continuity of the grating pattern was broken by an annulus of mean gray. Annulus inner diameter was around 1 deg. The gap between the outer and inner annulus radii ranged from 0.05 to 0.2 deg. To measure how much gamma-band power was evoked from the receptive field periphery, LFPs were recorded when the central disk region was blank.

A small visual gap of width 0.1deg greatly reduced LFP power at 50Hz for half of the recording sites (20/50) and gamma-band coherence also could be affected by image discontinuity. Furthermore, the amount of gamma-band activity evoked by annuli with inner diameters [[gt]] 1 deg was always small. Our results indicate that gamma-band activity in the LFP is a signal mainly from the local cortex and that image discontinuity can change the pattern of gamma-band activity.

Xing, D. Yeh, C.-I. Williams, P. Henrie, A. Shapley, R. (2009). Image discontinuity changes LFP gamma-band activity in primary visual cortex V1 [Abstract]. Journal of Vision, 9(8):753, 753a, http://journalofvision.org/9/8/753/, doi:10.1167/9.8.753. [CrossRef]
Footnotes
 This project was supported by NSF grant 0745253, NIH Grant R01 EY-01472 and the Swartz Foundation.
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