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Related Experiment Videos

Changes in visual receptive fields with microstimulation of frontal cortex.

Katherine M Armstrong1, Jamie K Fitzgerald, Tirin Moore

  • 1Department of Neurobiology, Stanford University School of Medicine, California 94305, USA.

Neuron
|May 30, 2006
PubMed
Summary
This summary is machine-generated.

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Stimulating the frontal eye field (FEF) in monkeys altered visual cortical neuron (V4) responses, mimicking attention. This suggests FEF signals help covertly select stimuli within receptive fields (RFs).

Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Attention Mechanisms

Background:

  • Attention modulates visual cortical neuron receptive fields (RFs).
  • Multiple stimuli compete for neural responses and influence behavior.

Purpose of the Study:

  • To investigate how stimulating the frontal eye field (FEF) affects V4 responses.
  • To determine if FEF stimulation mimics voluntary attention effects on visual processing.

Main Methods:

  • Subthreshold stimulation of the frontal eye field (FEF) in passively fixating monkeys.
  • Recorded neural responses in the V4 visual cortex.
  • Analyzed changes in V4 receptive field properties and stimulus interactions.

Main Results:

Related Experiment Videos

  • FEF stimulation enhanced visual responses at specific locations within V4 receptive fields.
  • Altered stimulus interactions within RFs, favoring stimuli aligned with the activated FEF site.
  • Demonstrated influence over which stimulus drove individual V4 neuron responses.

    • Conclusions:

    • Spatial signals from FEF are involved in covertly selecting among competing stimuli.
    • FEF plays a role in attentional selection within visual cortical neurons' RFs.
    • Findings link saccade preparation signals to stimulus selection in V4.