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Generation of Local CA1 γ Oscillations by Tetanic Stimulation
Published on: August 14, 2015
Self-paced movements induce high-frequency gamma oscillations in primary motor cortex
Douglas Cheyne1, Sonya Bells, Paul Ferrari
1Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada. douglas.cheyne@utoronto.ca
Neuroimage
|May 31, 2008
Summary
High-frequency gamma oscillations in the primary motor cortex increase during voluntary movements. This brain activity is effector-specific and may reflect feedback control networks for discrete movements.
Area of Science:
- Neuroscience
- Motor Control
- Brain Oscillations
Background:
- Increasing interest in high-frequency cortical oscillations (>30 Hz) during sensorimotor and cognitive tasks.
- High gamma activity in the motor cortex has been observed, but its role in motor control remains unclear.
Purpose of the Study:
- To investigate the functional role of high-frequency gamma oscillations in the primary motor cortex during self-paced movements.
- To identify the timing, localization, and effector specificity of these oscillations.
Main Methods:
- Whole-head magnetoencephalography (MEG) recordings.
- Advanced source localization techniques.
- Analysis of self-paced index finger, elbow, and foot movements.
Main Results:
- High-frequency (65-80 Hz) gamma oscillations were identified in the primary motor cortex (MI) during self-paced movements.
- Gamma activity increased during movement, peaking 100-250 ms post-EMG onset, and was lateralized to contralateral MI.
- Peak gamma frequency varied by effector (foot vs. finger/elbow), suggesting effector-specific activation.
Conclusions:
- Voluntary movements elicit effector-specific high-frequency gamma oscillations in the primary motor cortex.
- These oscillations may indicate the involvement of cortico-subcortical networks in the feedback control of discrete movements.
