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Effect of Contrast on Visual Spatial Summation in Different Cell Categories in Cat Primary Visual Cortex

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  • Ke Chen
  • Ai-Min Ding
  • Xiao-Hua Liang
  • Li-Peng Zhang
  • Ling Wang
  • Xue-Mei Song

Abstract

Multiple cell classes have been found in the primary visual cortex, but the relationship between cell types and spatial summation has seldom been studied. Parvalbumin-expressing inhibitory interneurons can be distinguished from pyramidal neurons based on their briefer action potential durations. In this study, we classified V1 cells into fast-spiking units (FSUs) and regular-spiking units (RSUs) and then examined spatial summation at high and low contrast. Our results revealed that the excitatory classical receptive field and the suppressive non-classical receptive field expanded at low contrast for both FSUs and RSUs, but the expansion was more marked for the RSUs than for the FSUs. For most V1 neurons, surround suppression varied as the contrast changed from high to low. However, FSUs exhibited no significant difference in the strength of suppression between high and low contrast, although the overall suppression decreased significantly at low contrast for the RSUs. Our results suggest that the modulation of spatial summation by stimulus contrast differs across populations of neurons in the cat primary visual cortex.

Suggested Citation

  • Ke Chen & Ai-Min Ding & Xiao-Hua Liang & Li-Peng Zhang & Ling Wang & Xue-Mei Song, 2015. "Effect of Contrast on Visual Spatial Summation in Different Cell Categories in Cat Primary Visual Cortex," PLOS ONE, Public Library of Science, vol. 10(12), pages 1-14, December.
    • Handle: RePEc:plo:pone00:0144403
    DOI: 10.1371/journal.pone.0144403
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    1. Seung-Hee Lee & Alex C. Kwan & Siyu Zhang & Victoria Phoumthipphavong & John G. Flannery & Sotiris C. Masmanidis & Hiroki Taniguchi & Z. Josh Huang & Feng Zhang & Edward S. Boyden & Karl Deisseroth & , 2012. "Activation of specific interneurons improves V1 feature selectivity and visual perception," Nature, Nature, vol. 488(7411), pages 379-383, August.
    2. Yumiko Yoshimura & Jami L. M. Dantzker & Edward M. Callaway, 2005. "Excitatory cortical neurons form fine-scale functional networks," Nature, Nature, vol. 433(7028), pages 868-873, February.
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