title: "Cross-talk" in recording evoked potentials.
abstract: When two potentials having large amplitude differences are simultaneously recorded, the large amplitude potential contaminates the small amplitude response. The small, early potentials generated by this contamination resemble far-field potentials. Although scalp-recorded SEP was contaminated by waves similar to the peripheral potential, peak latencies and wave form were not identical. Experiments simulating the recording situation verified the presence of "cross-talk." Capacitive coupling would shift peaks and alter the wave forms. Other possible mechanisms for the cross-talk and methods of minimizing it are offered. One should be cautious interpreting the results when potentials of large amplitude differences are simultaneously recorded.
mesh_terms: D004558:Electric Stimulation; D004569:Electroencephalography; D004594:Electrophysiology / Q000379:methods; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D006801:Humans; D008297:Male