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Related Experiment Video

Updated: Aug 16, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Proprioceptive and Visual Feedback Responses in Macaques Exploit Goal Redundancy.

Kevin P Cross1,2, Hui Guang2, Stephen H Scott2,3,4

  • 1University of North Carolina Neuroscience Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599 13kc18@queensu.ca.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 19, 2022
PubMed
Summary

Monkeys, like humans, can flexibly adjust their movements to account for goal redundancy. This study shows rapid motor corrections in macaques exploit goal shape, providing a model for neural basis research.

Keywords:
OFCmacaqueproprioceptionredundancyvision

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Area of Science:

  • Neuroscience
  • Motor Control
  • Primate Behavior

Background:

  • Motor control involves generating muscle activity for behavioral goals, often with redundant solutions.
  • Optimal feedback control theory suggests kinematic errors are ignored if the goal is still reachable.
  • Human studies show rapid integration of feedback (visual/proprioceptive) with goal redundancy.

Purpose of the Study:

  • To investigate if monkeys (Macaca mulatta) exhibit similar abilities to exploit goal redundancy as humans.
  • To develop a behavioral paradigm in monkeys to study the neural basis of goal-directed motor action and redundancy.

Main Methods:

  • Trained four male monkeys to reach for narrow square or wide rectangular goals.
  • Introduced perturbations: visual feedback jumps and mechanical arm loads.
  • Recorded muscle activity to detect corrective responses to perturbations.

Main Results:

  • Monkeys showed greater trial-by-trial variability for wide goals, indicating exploitation of redundancy.
  • Monkeys corrected visual feedback jumps for narrow goals but largely ignored them for wide goals.
  • Similar corrective responses to mechanical loads were observed based on goal shape, with timings around 70-90 ms.

Conclusions:

  • Rapid motor responses in macaques can exploit goal redundancy, mirroring human capabilities.
  • The developed behavioral paradigm offers a model for investigating the neural correlates of rapid motor corrections and redundancy.
  • This research bridges the gap in understanding the neural basis of sophisticated motor control in an animal model.