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Neural correlates for task switching in the macaque superior colliculus.

Jason L Chan1, Michael J Koval1, Kevin Johnston1,2

  • 1Graduate Program in Neuroscience, University of Western Ontario, London, Ontario, Canada.

Journal of Neurophysiology
|August 11, 2017
PubMed
Summary

Task switching involves brain networks. In macaque monkeys, behavioral switch costs were linked to changes in superior colliculus (SC) neural activity, suggesting SC involvement in task set reconfiguration.

Keywords:
anti-saccadetask settask switchingtop-down control

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Research

Background:

  • Task switching relies on frontoparietal networks for rule selection and control.
  • The role of execution-related brain areas, like the superior colliculus (SC), in task switching remains unclear.
  • The SC integrates information for saccade generation and may be influenced by task switching demands.

Purpose of the Study:

  • Investigate behavioral switch costs in nonhuman primates.
  • Identify neural correlates of task switching in the superior colliculus (SC).
  • Examine SC saccade-related neuron activity during cued, interleaved pro- and anti-saccade trials.

Main Methods:

  • Monkeys performed cued, randomly interleaved pro- and anti-saccade tasks.
  • Behavioral data (reaction time, error rate) were collected.
  • Neural activity of SC saccade-related neurons was recorded and analyzed.

Main Results:

  • Observed significant behavioral switch costs (error rate and reaction time).
  • Found differential modulations in SC neuron discharge rate and timing between switch and repeat trials.
  • These neural changes occurred after cue fixation but before saccade onset.

Conclusions:

  • Established behavioral switch costs in macaque monkeys.
  • Demonstrated that SC activity is modulated by task-switching processes.
  • Results suggest the SC reflects task set reconfiguration, challenging the concept of task set inertia.