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Separating the Idea from the Action: A sLORETA Study.

Martin Rakusa1,2, Pierpaolo Busan3, Piero Paolo Battaglini4

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|August 16, 2017
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Summary

Imagining reaching movements activates brain areas differently than actual movements. Actual reaching involves more extensive cortical activation, suggesting distinct neural systems for planning and executing movements.

Keywords:
ElectroencephalographyMotor imageryReachingSensory-motor networkStandardized low-resolution brain electromagnetic tomography

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • Imaginary movements activate similar brain regions as actual movements, primarily within the sensory-motor network.
  • Limited research has explored the neural correlates of imagining complex motor skills like reaching.

Purpose of the Study:

  • To compare the neural activation patterns during actual and imagined reaching movements.
  • To investigate differences in brain activity during the preparation phase of these two conditions.

Main Methods:

  • Ten volunteers performed and imagined reaching movements.
  • Electroencephalography (EEG) was recorded and analyzed using standardized low-resolution brain electromagnetic tomography (sLORETA).
  • Comparisons were made between actual and imagined reaching conditions relative to baseline and between tasks.

Main Results:

  • Significant differences in brain activation were observed at three distinct time intervals after target presentation, favoring actual reaching.
  • Early differences (160-220 ms) were noted in frontal and parietal regions.
  • Later differences (220-320 ms and >320 ms) appeared in the premotor and perirolandic cortex, respectively.
  • Anterior and posterior cingulate cortices showed involvement in both tasks.

Conclusions:

  • Two distinct neural systems likely contribute to actual reaching.
  • One system, heavily involved in actual reaching, integrates sensory information and motor programs via premotor, supplementary motor, primary motor, parietal, and occipital cortices.
  • A second, shared system involving cingulate cortices may support awareness and process integration for both actual and imagined movements.