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Inhibitory tagging in the superior colliculus during visual search.

Christopher Conroy1, Rakesh Nanjappa1,2, Robert M McPeek1

  • 1Department of Biological and Vision Sciences, SUNY College of Optometry, New York, New York, United States.

Journal of Neurophysiology
|September 6, 2023
PubMed
Summary
This summary is machine-generated.

Inhibitory tagging, a mechanism that suppresses previously viewed items, is represented in the superior colliculus (SC) during visual search. This finding supports the SC's role in guiding eye movements by prioritizing targets.

Keywords:
inhibitory taggingsaccadessuperior colliculustarget selection

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Ophthalmology

Background:

  • Inhibitory tagging is crucial for efficient visual search and saccade target selection.
  • The superior colliculus (SC) is a potential neural substrate for priority mapping in vision.
  • The representation of inhibitory tagging within the SC during visual search remains uncharacterized.

Purpose of the Study:

  • To investigate whether superior colliculus (SC) neurons exhibit inhibitory tagging during a visual search task.
  • To determine if SC activity reflects the suppression of previously fixated stimuli.
  • To assess the role of the SC in implementing inhibitory tagging for saccade target selection.

Main Methods:

  • Recorded neuronal activity in the SC of subjects performing a multisaccade visual-search task.
  • Presented stimuli including reward-bearing targets and non-reward-bearing distractors in an array.
  • Manipulated stimulus history by varying previous fixation duration and number of intervening saccades.

Main Results:

  • SC neuronal activity was higher for targets than distractors when stimuli were in the response field.
  • Activity was reduced for previously fixated stimuli compared to non-fixated stimuli.
  • This reduction was more pronounced for targets than distractors and diminished over time/saccades.

Conclusions:

  • SC neurons transiently inhibit previously fixated stimuli during visual search.
  • These findings support the hypothesis that the SC contributes to a priority map through inhibitory tagging.
  • The SC plays a significant role in efficient saccade target selection by representing inhibitory tagging.