Evoked potential
Evoked potential or EP is a test that measures the electrical activity of the brain in response to stimulation of specific sensory nerve pathways. The term "evoked potential" means electrical potential (voltage) that is generated (evoked) in response to some event or stimulus.
Overview
Evoked potentials are very small voltages that are generated by the brain structures in response to specific events or stimuli. These voltages can be extracted from the electroencephalographic (EEG) activity recorded from the scalp. Evoked potentials are useful in clinical neurophysiology to assess the functional integrity of specific neural pathways.
Types of Evoked Potentials
There are several types of evoked potentials, including:
- Visual Evoked Potential (VEP): This test measures the electrical signals in the brain that occur in response to visual stimuli. It is often used to diagnose and monitor diseases that affect the optic nerves and visual pathways in the brain.
- Auditory Evoked Potential (AEP): This test measures the electrical signals in the brain that occur in response to auditory stimuli. It is often used to diagnose and monitor diseases that affect the auditory nerves and auditory pathways in the brain.
- Somatosensory Evoked Potential (SEP): This test measures the electrical signals in the brain that occur in response to tactile or proprioceptive stimuli. It is often used to diagnose and monitor diseases that affect the sensory nerves and sensory pathways in the brain.
Clinical Uses
Evoked potentials are used in clinical practice to assess the functional integrity of the sensory pathways in the brain. They are often used to diagnose and monitor diseases that affect the optic nerves, auditory nerves, and sensory nerves. They can also be used to monitor the progress of these diseases and the effectiveness of treatment.
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