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Bimanual passive movement: functional activation and inter-regional coupling.

Emiliano Macaluso1, Andrea Cherubini, Umberto Sabatini

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Passive movement influences sensory-motor network connectivity. Asymmetric bimanual movements increase activation, while rest shows highest connectivity, offering insights for patients with limited mobility.

Keywords:
bimanualeffective connectivityfMRIpassive movement

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Area of Science:

  • Neuroscience
  • Motor Control
  • Brain Imaging

Background:

  • Understanding sensory-motor system function is crucial for neurological research.
  • Passive movement paradigms offer a unique approach to studying brain responses without active motor commands.

Purpose of the Study:

  • To investigate intra-regional activation and inter-regional connectivity within the sensory-motor network during passive finger movements.
  • To explore how movement symmetry (unimanual vs. bimanual, symmetric vs. asymmetric) affects brain activation and connectivity patterns.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to monitor brain activity.
  • Subjects underwent passive, mechanically induced movements of the index and middle fingers under four conditions: unimanual left/right, bimanual symmetric/asymmetric, and rest.
  • Analyses focused on intra-regional activation and inter-regional functional connectivity (coupling) within the sensory-motor network.

Main Results:

  • Passive stimulation activated a network including the motor cortex, somatosensory cortex, and cerebellum.
  • The posterior sensory-motor cortex showed greater activation during asymmetric compared to symmetric bimanual movements.
  • Inter-regional connectivity was high within the network, with the highest coupling observed during rest. Bimanual conditions showed higher coupling between homologous sensory-motor regions than unimanual conditions.

Conclusions:

  • Passive movement modulates functional connectivity within the sensory-motor network.
  • Implicit detection of movement asymmetry involves associative somatosensory regions.
  • Passive stimulation appears to reduce functional connectivity within the passive movement network.
  • This approach may be valuable for assessing sensory-motor function in patients with severe mobility impairments.