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Graded Neuronal Modulations Related to Visual Spatial Attention.

J Patrick Mayo1, John H R Maunsell2

  • 1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, and mayo@neuro.duke.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 13, 2016
PubMed
Summary

Visual attention in macaque monkeys shows graded neuronal activity in area V4 during neutral cueing, mirroring human studies. This suggests attention is hemisphere-specific and adapts to task demands, not a single spotlight.

Keywords:
macaqueneuronal correlationspopulation codingspatial attentionvisionvisual area V4

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Attention

Background:

  • Studies on visual attention in monkeys typically use cued vs. uncued stimuli.
  • Human studies show intermediate performance in neutral cueing conditions.
  • Neuronal basis of neutral cueing in monkeys remains unclear.

Purpose of the Study:

  • To investigate neuronal correlates of visual attention during neutral cueing in macaque monkeys.
  • To compare monkey neuronal activity with human psychophysical findings.
  • To determine if attention operates as a unitary spotlight or is hemisphere-specific.

Main Methods:

  • Trained macaque monkeys on a visual detection task with cued, uncued, and neutral cueing conditions.
  • Measured behavioral performance and neuronal activity in visual area V4.
  • Recorded simultaneously from both hemispheres to assess attention switching.

Main Results:

  • Behavioral performance was graded: best in cued, intermediate in neutral, worst in uncued conditions.
  • Neuronal modulations in V4 were also graded, correlating with cue validity and performance.
  • No evidence for a unitary spotlight of attention switching between hemispheres was found.

Conclusions:

  • Attention-related neuronal changes in V4 are graded and adapt to task demands.
  • Findings suggest attention mechanisms are largely hemisphere-specific.
  • Results align with human psychophysical data on neutral cueing.