EEG Oscillations in Specific Frequency Bands Are Differently Coupled with Angular Joint Angle Kinematics during...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Motor Control

Background:

• Rhythmic passive movements are utilized in rehabilitation to enhance physical functions.
• While sensorimotor cortex oscillations during active movements are studied, their role in passive movements remains less understood.
• The precise relationship between movement rhythms and cortical oscillations during passive limb motion requires further investigation.

Purpose of the Study:

• To quantitatively assess changes in cortical oscillations during rhythmic passive movements.
• To investigate the relationship between specific brain oscillation frequencies and externally cued passive limb movements.

Main Methods:

• Twenty healthy young adults underwent electroencephalography (EEG) recording.
• EEG electrodes were placed over a nine-position grid centered on the biceps brachii muscle's transcranial magnetic stimulation hotspot.
• Participants performed rhythmic elbow flexion and extension synchronized with a 0.67 Hz light-emitting diode cue.

Main Results:

• A higher degree of coherence was observed between high-beta and low-gamma oscillations and the passive movement rhythm.
• Coherence between alpha oscillations and the passive movement rhythm was significantly lower compared to high-beta and low-gamma bands.
• These findings indicate distinct neural processing for different oscillatory frequencies during passive limb movement.

Conclusions:

• Alpha, beta, and gamma oscillations in the primary motor cortex exhibit differential relationships with passive movement rhythms.
• High-beta and low-gamma oscillations are more closely associated with the processing of rhythmic passive movements than alpha oscillations.
• This research provides quantitative insights into the neural mechanisms underlying sensorimotor cortex engagement during passive rehabilitation exercises.