Patterns of excitation and inhibition evoked by horizontal connections in visual cortex share a common relationship to orientation columns.

Published

Journal Article

Combined optical imaging and electrophysiological techniques were used to assess directly the functional nature of long-range excitatory and inhibitory synaptic interactions between orientation columns in area 17 of ferret visual cortex. A significant correlation was found between the layout of iso-orientation columns and the pattern of evoked synaptic inputs between cortical sites: the largest-amplitude inhibitory and excitatory synaptic responses were evoked in single neurons when stimulation and recording electrodes were located in orientation columns sharing the same angle preference. Both excitatory and inhibitory synaptic responses decreased in amplitude when stimulation and recording electrodes were located in orientation columns with orthogonal angle preferences. Changing the stimulus intensity altered the balance of evoked excitation and inhibition without changing the columnar specificity of inputs. These results directly demonstrate that horizontal connections modulate both excitatory and inhibitory synaptic interactions between iso-orientation columns.

Full Text

Duke Authors

Cited Authors

  • Weliky, M; Kandler, K; Fitzpatrick, D; Katz, LC

Published Date

  • September 1995

Published In

Volume / Issue

  • 15 / 3

Start / End Page

  • 541 - 552

PubMed ID

  • 7546734

Pubmed Central ID

  • 7546734

International Standard Serial Number (ISSN)

  • 0896-6273

Digital Object Identifier (DOI)

  • 10.1016/0896-6273(95)90143-4

Language

  • eng

Conference Location

  • United States