Evoked potential tests are important neurological examinations that can complement imaging methods.
Evoked potential tests measure the function of sensory systems and central nervous system pathways by recording responses triggered by various stimuli.
The physician who referred you for the examination will inform you of the results and how treatment will proceed. If you do not have a scheduled appointment or call time, please contact your care unit.
The purpose of the Somatosensory evoked potential (SEP) examination is to assess the function of the sensory pathways in the nervous system. The stimuli are small electrical pulses applied, for example, to the wrist or ankle. The progression of nerve impulses from the stimulation site to the cerebral cortex is measured using sensors attached to the skin.
In a VEP-examination (Visual Evoked Potential), changes in brain electrical activity caused by visual stimuli are measured using sensors attached to the scalp. The examination provides information about the function of the visual pathways. Stimuli may include flashing lights or changing grid patterns.
Electroretinography (ERG) is used to assess the electrical function of the retina. Flashing light stimuli generate responses in the retinal photoreceptor cells, which are measured using contact lens-like electrodes.
The brainstem auditory evoked potential (BAEP) examination is used to examine the function of the auditory pathways from the ear to the brainstem. Responses to sound stimuli delivered through headphones are measured using sensors attached to the scalp.
Motor evoked potential (MEP) examination assess the function of motor pathways. The stimulus is delivered using a magnetic coil, which activates the cerebral cortex externally and nerve roots in the neck and lower back. The resulting muscle contractions in the arms and legs are measured using sensors attached to the skin.
Contact heat evoked potential (CHEP) examinations measure pathways that transmit temperature sensations. A heat stimulus is applied to the skin, and the brain’s response is recorded using sensors attached to the scalp. This examination is used, for example, to examine peripheral nervous system diseases and injuries.
Updated 21.11.2025
