• L McLean, R N Scott, and P A Parker.
• University of New Brunswick, Department of Electrical Engineering, Fredericton, Canada.
• Arch Phys Med Rehabil. 1996 Dec 1; 77 (12): 1286-92.

ObjectiveTo investigate the main coupling mechanisms involved in stimulus artifact contamination of evoked potential recordings and to suggest techniques that minimize this interference.DesignA before-after trial of a single subject.SettingMeasurements were obtained at a university biomedical engineering laboratory.ParticipantsData were obtained from one volunteer subject.InterventionAn electrical stimulus was used to depolarize the posterior tibial nerve at the ankle. Various recording electrode configurations were used to demonstrate stimulus artifact recordings.ResultsThree mechanisms are defined as contributing significantly to stimulus artifact contamination of evoked potential data. These are: the volume conducted component, the displacement current component, and the electromagnetic coupling component. When each component is maximally controlled, the problem of stimulus artifact is greatly reduced.ConclusionThree major factors that contribute to stimulus artifact contamination of the evoked potential waveform can be identified and minimized by relatively simple clinical techniques.

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