Related Experiment Videos
Cortical potentials following voluntary and passive finger movements
Electroencephalography and Clinical Neurophysiology
|November 1, 1980
Summary
Movement-related cortical potentials were compared between voluntary and passive finger movements. Similarities in specific peaks suggest kinesthetic feedback from muscle afferents may generate these potentials.
Area of Science:
- Neuroscience
- Motor Control
- Electrophysiology
Background:
- The movement-related cortical potential (MRCP) is crucial for understanding voluntary movement.
- The functional significance and timing of post-motion components require further clarification.
Purpose of the Study:
- To elucidate the temporal relationship and functional role of post-motion MRCP components.
- To compare scalp topography of potentials evoked by voluntary versus passive finger movements.
Main Methods:
- Simultaneous recording of 14-channel scalp EEG, EOG, and EMG in 7 healthy adults.
- Comparison of averaged cortical potentials during self-paced voluntary finger extension and experimenter-induced passive finger extension.
- Opisthochronic averaging of potentials triggered by finger movement via a light beam interruption.
Main Results:
- Seven peaks identified in passive movement-evoked potentials, including N15 over the contralateral precentral region and N70/P65 complex over frontal/parietal regions.
- The N70/P65 complex in passive movement shows similarities in waveform and topography to the N+50/P+90 complex in voluntary movement.
- N15 occurred 16 msec after the photometer trigger.
Conclusions:
- The N70/P65 complex in passive movement may originate from a central sulcus dipole.
- These components potentially represent kinesthetic feedback from muscle afferents during movement.
- This finding aids in understanding the neural processing underlying movement and sensory feedback.