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  • Neurologic electrodes designed to obtain responses of the brain after stimulation of specific sensory nerve pathways of the central nervous system structures (i.e., evoked potentials, EP). The electrodes measure and record how quickly and completely the nerve signals reach the brain. These electrodes can be either surface electrodes (e.g., cups) or transdermal platinum needles; the cups are secured with collodion and tape. The electrodes are applied to the subject at the desired locations and connected to the EP unit (e.g., recorder, monitor) through a preamplifier and an electrode board, allowing various channel-switching options. The electrodes can be placed along the scalp, shoulders, earlobes, wrists, lower back, and other anatomical locations; they are typically disposable, but some reusable types are available. EP electrodes are used for clinical studies mainly intended to show abnormalities on the nerve pathways that can be caused by neurological disorders; dedicated electrodes intended for auditory, visual, and somatosensory responses are available.
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