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Assessing Corticospinal Excitability During Goal-Directed Reaching Behavior
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Decoding Movement Goals from the Fronto-Parietal Reach Network.

Hanna Gertz1, Angelika Lingnau2, Katja Fiehler1

  • 1Experimental Psychology, Justus-Liebig University Giessen Giessen, Germany.

Frontiers in Human Neuroscience
|March 14, 2017
PubMed
Summary
This summary is machine-generated.

Frontoparietal brain regions encode movement goals during reach planning. The dorsal premotor cortex (PMd) and superior parietal lobule (SPL) represent prospective motor codes, with PMd also involved in movement goal selection.

Keywords:
MVPAambiguous reach goalsfMRIreach planningsensorimotor integration

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • Fronto-parietal brain areas are crucial for transforming sensory input into motor commands during reach planning.
  • A key debate exists on whether these areas retain sensory cue information or motor goal representations.

Purpose of the Study:

  • To investigate the nature of representations in fronto-parietal regions during reach planning.
  • To differentiate between sensory and motor representations by dissociating visual cue position from reach goal.
  • To explore the role of context rules in specifying movement goals.

Main Methods:

  • Utilized a delayed pro-/anti-reach task to manipulate movement goal specification.
  • Employed functional magnetic resonance imaging (fMRI) with multivoxel pattern analysis (MVPA).
  • Analyzed brain activity patterns in fronto-parietal areas under specified and underspecified movement goal conditions.

Main Results:

  • Movement goal encoding was observed in the left dorsal premotor cortex (PMd) and bilateral superior parietal lobule (SPL) when the reach goal was specified.
  • When the reach goal was underspecified, only PMd, not SPL, represented the visual cue position.
  • This suggests a differential role for PMd and SPL in sensorimotor integration and goal selection.

Conclusions:

  • Fronto-parietal reach regions (PRRs) maintain a prospective motor code during reach planning.
  • The dorsal premotor cortex (PMd) appears to play a role in movement goal selection and sensorimotor integration.
  • The superior parietal lobule (SPL) is involved in representing specified movement goals, suggesting a distinct contribution to reach planning.