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Jacqueline A Palmer1, Lewis A Wheaton2, Whitney A Gray1

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This summary is machine-generated.

Transcranial magnetic stimulation (TMS)-evoked cortical coherence during hand muscle activation reveals altered interhemispheric interactions in stroke survivors, impacting motor function recovery.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Motor Control

Background:

  • Stroke survivors exhibit altered interhemispheric interactions.
  • Understanding these changes is crucial for improving motor function recovery.

Purpose of the Study:

  • To investigate interhemispheric interactions in stroke survivors using TMS-evoked cortical coherence.
  • To assess the effect of TMS on coherence during rest and active muscle contraction.
  • To evaluate relationships between coherence, motor function, and the ipsilateral cortical silent period (iSP).

Main Methods:

  • 19 chronic stroke survivors and 14 controls underwent TMS of primary motor cortex (M1) during rest and hand muscle contraction.
  • EEG and EMG recorded evoked responses, calculating interhemispheric beta coherence (15-30 Hz).
  • Ipsilateral cortical silent period (iSP) duration was measured during active contraction.

Main Results:

  • Active TMS increased interhemispheric coherence in controls, but not in stroke survivors.
  • Stroke survivors showed reduced coherence during active i/ndM1 TMS, negatively associated with paretic arm motor function.
  • Paretic iSP was longer in stroke survivors and negatively associated with manual dexterity.

Conclusions:

  • TMS-evoked cortical coherence during hand muscle activation reflects interhemispheric interactions post-stroke.
  • This measure offers insights into neural mechanisms influencing motor recovery.
  • It may serve as a potential biomarker for assessing functional recovery post-stroke.