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First spikes in visual cortex enable perceptual discrimination.

Arbora Resulaj1,2,3, Sarah Ruediger1,2,3, Shawn R Olsen1,2,4

  • 1Center for Neural Circuits and Behavior, Neurobiology Section, University of California, San Diego, San Diego, United States.

Elife
|April 17, 2018
PubMed
Summary
This summary is machine-generated.

A brief time window of activity in the visual cortex (VC) is sufficient for perceptual decisions. This study found that the threshold duration for visual cortical activity enabling perception is 40-80 milliseconds.

Keywords:
electrophysiologymouseneuroscienceoptogeneticsperceptual discriminationprimary visual cortex

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Perceptual decisions rely on sequential processing across cortical areas.
  • The precise time window of neural activity required for these decisions remains unquantified.

Purpose of the Study:

  • To measure the minimal time window of visual cortex activity necessary for perceptual decision-making.
  • To investigate the relationship between neural firing patterns and decision thresholds.

Main Methods:

  • Developed a visual discrimination task in mice dependent on the visual cortex.
  • Precisely controlled the duration of visual cortical activity during the task.
  • Analyzed neuronal firing patterns within the critical time window.

Main Results:

  • The threshold duration of visual cortex activity for perceptual discrimination was determined to be between 40 and 80 milliseconds.
  • During this critical window, most neurons discriminating the stimulus fired one or no spikes.
  • Fewer than 16% of neurons exceeded two spikes within this time frame.

Conclusions:

  • The initial visually evoked spikes in the visual cortex are sufficient to enable perceptual decisions.
  • This finding provides direct evidence for the rapid processing capabilities of the visual cortex in decision-making.