Otto-von-Guericke-Universität Magdeburg

University Department of Neurology
 
 
 
 
 
 
 
 
 
 
 
 
eeg2
 

Evoked Potentials

Evoked potentials are the electrical signals generated by the nervous system in response to auditory, visual and somatosensory stimuli.

Somatosensory evoked potentials (SSEPs)
Evoked potentials are the electrical signals generated by the nervous system in response to sensory stimuli. They consist of a series of waves that reflect sequential activation of neural structures along the somatosensory pathways following electrical stimulation of peripheral nerves. In clinical practice, SSEPs are elicited typically by stimulation of the median nerve at the wrist and the posterior tibial nerve at the ankle and recorded from electrodes placed over the scalp, spine and peripheral nerves. A series of mild electrical currents will pass through the probe, causing your corresponding thumb or big toe to twitch. Although most people feel momentary discomfort as currents pass through the probe, they usually do not consider this test to be painful. Abnormal SSEPs can result from dysfunction at different levels of the peripheral and central nervous system. Since individuals have multiple parallel afferent somatosensory pathways, recordings of SSEPs can be normal even in patients with significant sensory deficits.

Brainstem Auditory evoked potentials (BAEP)
Brainstem Auditory evoked potentials evaluate the brainstem nervous system from the ear to the brain. Three or more electrodes are attached to the patient's scalp. The patient is asked to hear a series of clicking sounds while wearing headphones. Each ear is tested separatelyht.

Visual evoked potentials (VEP)
Visual evoked potentials evaluate the visual nervous system from the eye to the brain. Three or more electrodes are attached to the patient?s scalp. The patient is asked to stare at a pattern on a video screen. Each eye is tested separately. A patch is placed over the eye not being tested. Each test takes approximately 20 to 30 minutes to perform and is painless. You may resume your normal activities immediately after these tests.

previous next
Last Modification: 27.07.2015 - Contact Person: Ögelin Düzel
 
 
 
 
evokedPotentials
Evoked Potentials