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Cortical excitability correlates with the event-related desynchronization during brain-computer interface control.

Ian Daly1, Caroline Blanchard, Nicholas P Holmes

  • 1Brain-Computer Interfaces and Neural Engineering Laboratory, School of Computer Science and Electronic Engineering, University of Essex, Colchester, CO4 3SQ, United Kingdom.

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|February 15, 2018
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Summary

Brain-computer interfaces (BCIs) show promise for stroke rehabilitation by linking neural activity (ERD) and motor control. This study found ERD strength correlates with corticospinal excitability, but visual feedback did not alter it.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Brain-computer interfaces (BCIs) are explored for stroke rehabilitation, yet their mechanisms remain unclear.
  • A potential mechanism involves the relationship between event-related desynchronization (ERD) and corticospinal excitability.
  • Visual feedback is crucial in BCIs, but its effect on motor system activity is not fully understood.

Purpose of the Study:

  • To investigate the relationship between ERD strength and corticospinal excitability during BCI-controlled motor tasks.
  • To determine if visual feedback of ERD influences corticospinal excitability in BCIs for neurorehabilitation.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) to probe corticospinal excitability.
  • Measured ERD during hand contraction and relaxation tasks controlled by a BCI.
  • Delivered TMS at various time points relative to the ongoing ERD.

Main Results:

  • A significant correlation was identified between the strength of ERD and corticospinal excitability.
  • Visual feedback provided through the BCI did not significantly modulate corticospinal excitability.
  • The timing of ERD was found to be a key factor in its relationship with excitability.

Conclusions:

  • The findings suggest that ERD strength is a relevant neural correlate for corticospinal excitability in BCI applications.
  • Visual feedback, as implemented, may not be the primary driver for modulating corticospinal excitability in this context.
  • Future stroke rehabilitation strategies using BCIs could benefit from considering the temporal dynamics of ERD to enhance functional recovery.