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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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Related Experiment Video

Updated: Oct 11, 2025

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Higher order visual areas enhance stimulus responsiveness in mouse primary visual cortex.

Matthijs N Oude Lohuis1,2, Alexis Cervan Canton1,3, Cyriel M A Pennartz1,2

  • 1Cognitive and Systems Neuroscience Group, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098XH Amsterdam, The Netherlands.

Cerebral Cortex (New York, N.Y. : 1991)
|December 1, 2021
PubMed
Summary
This summary is machine-generated.

Feedback from higher visual areas enhances primary visual cortex (V1) responses to weak stimuli, improving visual processing. However, this comes at the cost of reduced orientation and direction selectivity in V1.

Keywords:
brain statehigher order visual areasorientation selectivitytop-down modulationvisual processing

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Sensory Systems

Background:

  • Higher visual areas surrounding the primary visual cortex (V1) are linked to complex functions like decision-making.
  • Emerging evidence suggests higher visual areas modulate V1 activity, refining visual processing.
  • The precise mechanisms of this top-down modulation remain under investigation.

Purpose of the Study:

  • To investigate how inactivating distinct higher visual areas impacts V1 responses to moving bars.
  • To determine if different higher visual areas exert similar or distinct modulatory effects on early visual processing.

Main Methods:

  • In vivo optogenetic inactivation of two higher order visual areas in mice.
  • Electrophysiological recordings in the primary visual cortex (V1) to measure neuronal responses.
  • Analysis of V1 neuronal responses to moving bar stimuli with varying properties.

Main Results:

  • Distinct higher visual areas similarly modulated early visual processing in V1.
  • These areas enhanced V1 stimulus responsiveness, particularly for weaker signals and non-preferred stimulus directions.
  • Inactivation led to increased orientation and direction selectivity in V1, suggesting a trade-off.

Conclusions:

  • Feedback from higher visual areas selectively amplifies weak sensory inputs to V1.
  • This amplification mechanism may contribute to more robust visual stimulus processing.
  • The findings challenge the prevailing view by showing similar modulatory effects from distinct higher visual areas.