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Related Experiment Videos

Tonic activity during visuo-oculomotor behavior in the monkey superior colliculus

J Kojima1, M Matsumura, M Togawa

  • 1Laboratory of Neural Control, National Institute for Physiological Sciences, Okazaki, Japan.

Neuroscience Research
|September 1, 1996
PubMed
Summary

The superior colliculus plays a role in cognitive functions. Neuronal activity in this brain region is linked to memory, movement preparation, and attention.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • The superior colliculus is a midbrain structure.
  • Its precise role in intermediary cognitive processes remains under investigation.

Purpose of the Study:

  • To investigate the involvement of the superior colliculus in memory, movement preparation, and peripheral attention.

Main Methods:

  • Single-cell recordings were performed in monkeys performing visuo-oculomotor tasks.
  • Tasks included delayed saccade (SACD), saccade with overlap target (SACO), and attention (ATT).
  • Tonic neuronal activities were analyzed and classified into four types: visuomotor, mnemonic motor, attention, and nonspecific.

Main Results:

  • 141 neurons with task-related tonic activity were recorded.

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  • In the intermediate layer, neurons were classified as visuomotor (13), mnemonic motor (15), attention (13), and nonspecific (67).
  • The superficial layer showed a predominance of nonspecific neurons.

    • Conclusions:

    • Tonic activities in the superior colliculus are associated with memory of target location.
    • These activities also relate to the preparation of saccades and peripheral attention.
    • The superior colliculus is implicated in intermediary cognitive functions.