Visual cortical simple cells: Who inhibits whom

Alan B. Saul

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Simple cells display a specific adaptation aftereffect when tested with drifting gratings. The onset of the response to each cycle of the grating is delayed after adapting, but the offset is unaffected. Testing with stationary bars whose luminance was modulated in time revealed that aftereffects occur only at certain points in both space and time. The aftereffects seen with moving stimuli were predicted from those seen with stationary stimuli. These adaptation experiments suggest a model that consists of mutually inhibitory simple cells that are in spatiotemporal quadrature. The inhibition is appropriately localized in space and time to create the observed aftereffects. In this model, inhibition onto direction-selective simple cells arises from simple cells with the same preferred direction.

Original languageEnglish (US)
Pages (from-to)667-673
Number of pages7
JournalVisual Neuroscience
Issue number4
StatePublished - Jul 1999
Externally publishedYes


  • Adaptation aftereffects
  • Direction selectivity
  • Negative feedback
  • Response timing
  • Spatiotemporal quadrature

ASJC Scopus subject areas

  • Physiology
  • Sensory Systems


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