Spatial coding of position and orientation in primary visual cortex.

Journal Article (Journal Article)

We examined the spatial distribution of population activity in primary visual cortex (V1) of tree shrews with optical imaging and electrophysiology. A line stimulus, thinner than the average V1 receptive field, evoked a broad strip of neural activity of nearly constant size for all stimulus locations tested within the central 10 degrees of visual space. Stimuli in adjacent positions activated highly overlapping populations of neurons; nevertheless, small changes in stimulus position produced orderly changes in the location of the peak of the population response. Statistically significant shifts in the population response were found for stimulus displacements an order of magnitude smaller than receptive field width, down to the limit of optical imaging resolution. Based on the pattern of population activity, we conclude that the map of visual space in V1 is orderly at a fine scale and has uniform coverage of position and orientation without local relationships in the mapping of these features.

Full Text

Duke Authors

Cited Authors

  • Bosking, WH; Crowley, JC; Fitzpatrick, D

Published Date

  • September 2002

Published In

Volume / Issue

  • 5 / 9

Start / End Page

  • 874 - 882

PubMed ID

  • 12195429

International Standard Serial Number (ISSN)

  • 1097-6256

Digital Object Identifier (DOI)

  • 10.1038/nn908


  • eng

Conference Location

  • United States