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EEG correlates of coordinate processing during intermanual transfer.

Regine K Lange1, Ben Godde, Christoph Braun

  • 1University of Tübingen, Institute of Medical Psychology and Behavioral Neurobiology, Gartenstr. 29, 72074, Tübingen, Germany.

Experimental Brain Research
|September 2, 2004
PubMed
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This study reveals how the brain recalls and modifies movement coordinates. The electroencephalogram (EEG) findings show distinct neural processing for intrinsic and extrinsic coordinate systems during learned and novel tasks.

Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Goal-directed movements involve translating visual target information (extrinsic, object-centered coordinates) into motor commands (intrinsic, body-related coordinates).
  • Intermanual transfer of learned movements depends on task orientation, involving recall or modification of these coordinate systems.

Purpose of the Study:

  • To investigate the neural processes underlying the recall and modification of extrinsic and intrinsic movement coordinates.
  • To examine brain activity using electroencephalogram (EEG) during a figure-drawing task with different hand and orientation conditions.

Main Methods:

  • Human participants performed a learned figure-drawing task with their right hand.
  • The task was replicated with the left hand in both original (Normal-task) and mirror-reversed (Mirror-task) orientations.

Related Experiment Videos

  • Electroencephalogram (EEG) was recorded to analyze brain activity, specifically beta-power, alpha- and beta-coherence, and event-related potentials.

    • Main Results:

    • Prior to movement, decreased beta-power and alpha/beta-coherence were observed in the Normal-task compared to the Learned-task, suggesting intrinsic coordinate processing.
    • Increased negative amplitudes over fronto-central sites during the Normal-task indicated cerebral activation related to intrinsic coordinate modification.
    • Enhanced fronto-parietal coherence during the Mirror-task suggested cortical network activation for extrinsic coordinate modification.

    Conclusions:

    • The pre-movement period involves processing intrinsic coordinates.
    • Cerebral activation and altered coherence patterns reflect the modification of intrinsic coordinates during the Normal-task and extrinsic coordinates during the Mirror-task.
    • These findings elucidate the neural mechanisms governing coordinate transformations in motor control.