A test of nerve response that uses electrodes placed on the scalp to measure brain reaction to a stimulus such as a touch.
the electrical response of the central nervous system produced by an external stimulus; "he measured evoked potentials with an electroencephalogram"
Recordings of the nervous system's electrical response to the stimulation of specific sensory pathways(e.g. visual, auditory, general sensory). In tests of evoked potentials, a person's recorded responses are displayed on a oscilloscope and analyzed on a computer which allows comparison with normal response times. Demyelination results in a slowing of response time. EP's can demonstrate patches of damage along specific nerve pathways whether or not symptoms are present, making this test useful in confirming the diagnosis of MS.
Registration of the electrical responses of active brain cells as detected by electrodes placed on the surface of the head at various places. The evoked potential, unlike the waves on an EEG, is elicited by a specific stimulus applied to the visual, auditory or other sensory receptors of the body. Evoked potentials are used to diagnose a wide variety of central nervous system disorders.
NAS Evoked potential is an electrical potential recorded from the scalp in response to transient acoustic stimuli. Typically, voltage measurements are obtained for a period of about 10msec following acoustic stimulus, which is repeated and summed several hundred or thousand times to permit extraction of the response from ongoing nonauditory neural activity. The judgement about whether a response has been obtained is normally based on the pattern observed in a visual display of the waveform.
An electric discharge in some part of the nervous system produced by stimulation elsewhere. The measured potential is commonly based on response averaging by a computer.
In neurophysiology, an evoked potential (or "evoked response") is an electrical potential recorded from a human or animal following presentation of a stimulus, as distinct from spontaneous potentials such as electroencephalograms or electromyograms. Evoked potential amplitudes tend to be low, ranging from less than a microvolt to several microvolts, compared to tens of microvolts for EEG, millivolts for EMG, and often close to a volt for EKG. To resolve these low-amplitude potentials against the background of ongoing EEG, EKG, EMG and other biological signals and ambient noise, signal averaging is usually required.
