Related Experiment Videos
Somatosensory evoked potential in man: far field potentials
Electroencephalography and Clinical Neurophysiology
|November 1, 1976
Summary
Short latency potentials from median nerve stimulation suggest far-field potentials. These potentials may originate from peripheral nerve fibers, brainstem, and diencephalic structures.
Area of Science:
- Neuroscience
- Electrophysiology
Background:
- Understanding the origin of early evoked potentials is crucial for diagnosing neurological conditions.
- Far-field potentials provide insights into neural pathway integrity.
Purpose of the Study:
- To investigate the origin of short-latency positive potentials evoked by median nerve stimulation.
- To differentiate between peripheral, brainstem, and diencephalic sources.
Main Methods:
- Recorded scalp, nose, and ear potentials following median nerve stimulation in 11 healthy adults.
- Utilized contralateral hand or knee as reference electrodes.
- Analyzed potential configuration over the cervical spine with different reference sites.
Main Results:
- Observed three short-latency positive potentials, consistent with volume-conducted far-field potentials.
- Evidence suggests the first potential originates in peripheral nerve fibers.
- Second and third potentials are proposed to arise from brainstem and diencephalic structures.
Conclusions:
- Short-latency potentials evoked by median nerve stimulation likely represent far-field potentials.
- The findings support distinct origins for early components, involving peripheral nerves and central nervous system structures.