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Related Experiment Videos

Beyond the classical receptive field in the visual cortex.

R D Freeman1, I Ohzawa, G Walker

  • 1Group in Vision Science, School of Optometry, University of California, Berkeley, CA 94720-2020, USA. freeman@neurovision.berkeley.edu

Progress in Brain Research
|November 13, 2001
PubMed
Summary
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Neurons in the visual cortex receive suppressive input from outside their classical receptive field (CRF). This inhibition can be reversed by orthogonal stimuli, suggesting complex surround modulation in visual processing.

Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Sensory Processing

Background:

  • The classical receptive field (CRF) is traditionally considered the primary area driving neuronal responses in the visual cortex.
  • Understanding the influence of extrastriate regions and the surround is crucial for comprehending visual perception.
  • Investigating inhibitory interactions beyond the CRF provides insights into neural computation.

Purpose of the Study:

  • To investigate the organization and functional role of neuronal regions outside the classical receptive field (CRF) in the visual cortex.
  • To characterize the incidence, nature, and spatial organization of interactions originating from outside the CRF.
  • To explore the modulatory effects of specific stimuli on these extrastriate interactions.

Main Methods:

Related Experiment Videos

  • Electrophysiological recordings from individual neurons in the visual cortex.
  • Presentation of visual stimuli, including gratings, to map neuronal responses and receptive field properties.
  • Systematic manipulation of stimulus parameters (e.g., orientation, location) to probe interactions outside the CRF.
  • Analysis of neuronal firing rates and response patterns to determine the influence of surrounding stimuli.

Main Results:

  • A majority of visual cortical cells exhibit interactions from regions outside their CRF.
  • These extrastriate interactions are predominantly suppressive in nature.
  • The suppressive influence originates from specific, well-defined regions outside the CRF, comparable in effectiveness to a full annulus.
  • Inhibition from the surround can be reversed (disinhibition) by presenting a second, orthogonally oriented grating.
  • This disinhibition can fully counteract the suppressive effects of the surround.

Conclusions:

  • Neuronal responses in the visual cortex are significantly modulated by suppressive inputs from extrastriate regions.
  • The spatial organization of these suppressive surrounds is specific and functionally relevant.
  • A novel mechanism of disinhibition exists, where orthogonal stimuli can abolish surround suppression.
  • This disinhibition process may not be directly involved in figure/ground segregation, suggesting other roles in visual processing.