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Effector specificity in macaque frontal and parietal cortex.

Elsie Premereur1, Peter Janssen1, Wim Vanduffel2

  • 1Laboratory for Neurophysiology and Psychophysiology, KU Leuven, 3000 Leuven, Belgium.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 27, 2015
PubMed
Summary
This summary is machine-generated.

The study reveals two distinct brain networks, one for eye movements (saccades) and another for arm movements (reaches), operating largely independently in macaque cortex. These effector-specific networks show unique activation patterns during different tasks.

Keywords:
fMRIsaccades

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Brain Research

Background:

  • Previous studies on effector specificity in human cortex yielded conflicting results.
  • Single neurons in macaque frontal eye fields (FEFs) and lateral intraparietal area (LIP) show preferential activation for saccade-related processes.

Purpose of the Study:

  • To investigate effector preferences in macaque cortex using functional magnetic resonance imaging (fMRI).
  • To identify segregated cortical networks for saccade versus arm movements.

Main Methods:

  • A mixed block/event-related fMRI experiment was conducted in macaques.
  • Monkeys performed visually guided saccade, arm movement, and fixation-only tasks within single fMRI runs.
  • Task parameters, including cue detection and target identification, were identical across tasks.

Main Results:

  • Saccade-related activity was observed in parietal areas (V6, V6A, LIP, caudal intraparietal area) and frontal areas (FEF, 45a, 45b, 46).
  • Areas 45 and FEF showed decreased activity during arm movements compared to fixation.
  • Arm movement-related activity was found in medial/anterior intraparietal areas (MIP, AIP), parietal area PEip, somatosensory areas (S1, S2), and (pre)motor areas (F1, F3, F5, F6).
  • Several areas, including F1, F5, PEip, and somatosensory cortex, showed deactivations during saccades.
  • These deactivations were independent of training history or task switching.

Conclusions:

  • Two largely segregated and effector-driven cortical networks were identified in the macaque brain.
  • One network is primarily involved in saccade execution, while the other supports arm movements.
  • These findings provide insights into the neural basis of motor control and effector specificity.