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Stephane Clery1, Bruce G Cumming2, Hendrikje Nienborg3

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Summary
This summary is machine-generated.

Neurons in the visual cortex (V2) show decision-related activity during fine depth perception tasks in macaques. This activity deviates from predictions of optimal linear decoding, suggesting the brain uses different strategies for interpreting sensory information.

Keywords:
V2choice probabilitydiscriminationdisparitynonhuman primatereadout

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Vision Science

Background:

  • Fine stereoscopic depth judgments rely on relative binocular disparity, not absolute disparity.
  • Visual area V2 is the earliest known site with neurons selective for relative disparity.
  • Decision-related activity in sensory neurons offers insights into brain information processing.

Purpose of the Study:

  • To investigate the role of V2 neurons in fine disparity discrimination tasks.
  • To test whether optimal linear decoding explains the relationship between neural activity and perceptual decisions.
  • To analyze decision-related activity in V2 and compare it with theoretical predictions.

Main Methods:

  • Recording neural activity from V2 neurons in macaques trained on a fine disparity discrimination task.
  • Analyzing the selectivity of V2 neurons for the task and their correlation with perceptual decisions.
  • Comparing observed neural data with predictions from decoding schemes that account for noise correlations.

Main Results:

  • Disparity-selective neurons in V2 showed high task selectivity and activity correlated with perceptual decisions.
  • Observed decision-related activity in V2 significantly deviated from predictions of optimal linear readout.
  • Previously reported data for coarse disparity discrimination also deviated quantitatively from predictions.

Conclusions:

  • V2 neurons play a role in fine disparity discrimination, with their activity linked to perceptual choices.
  • Optimal linear decoding is not a universally applicable model for how the brain interprets early sensory information in perceptual tasks.
  • The brain may employ alternative strategies beyond simple linear readout for processing sensory data.