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Neuronal modulation in the mouse superior colliculus during covert visual selective attention.

Lupeng Wang1, James P Herman2, Richard J Krauzlis3

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|February 16, 2022
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Neurons in the superior colliculus (SC) enhance activity at cued locations during covert visual attention, not by suppressing other areas. This mechanism aids in focusing on relevant visual information.

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Covert visual attention involves multiple brain regions, including the visual cortex and subcortical circuits.
  • Subcortical contributions to attention, particularly spatial selection and distraction suppression, remain less understood.
  • The superior colliculus (SC) plays a role in visual processing and attention.

Purpose of the Study:

  • To investigate how neuronal activity in the intermediate layers of the superior colliculus (SC) is modulated during covert visual attention in mice.
  • To elucidate the specific mechanisms (enhancement vs. suppression) by which the SC contributes to attentional selection.

Main Methods:

  • Recorded neuronal activity in the intermediate layers of the superior colliculus (SC) of head-fixed mice.
  • Used spatial cues to probe attentional modulation during a covert visual attention task.
  • Analyzed firing rates and spike-count correlations in response to cued and uncued locations.

Main Results:

  • Spatial cues modulated both firing rate and spike-count correlations in SC neurons.
  • Modulation involved enhancement of activity at the cued location, not suppression at uncued locations.
  • This enhancement improved neuronal discriminability of visual-change-evoked activity between contralateral and ipsilateral SC.

Conclusions:

  • Neurons in the mouse SC contribute to covert visual selective attention.
  • The SC biases processing towards locations expected to contain task-relevant information through enhancement mechanisms.
  • Findings clarify the role of subcortical circuits in attentional selection.