Visual evoked potential
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2008-06-21T15:34:30Z
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{{redirect-acronym|VEP|[[vertebra]]l endplate}}
{{Mergeto|evoked potential|date=August 2007}}
A '''visual evoked potential''' (VEP) is an [[evoked potential]] caused by sensory stimulation of a subject's [[visual field]] and is observed using [[electroencephalography]]. Commonly used visual stimuli are flashing lights, or checkerboards on a video screen that flicker between black on white to white on black (invert contrast).
Visual evoked potentials are very useful in detecting [[blindness]] in patients that cannot communicate, such as babies or non-human animals. If repeated stimulation of the visual field causes no changes in [[Electroencephalography|EEG]] potentials, then the subject's brain is probably not receiving any signals from his/her eyes. Other applications include the diagnosis of [[optic neuritis]], which causes the signal to be delayed. Such a delay is also a classic finding in [[Multiple Sclerosis]]. Visual evoked potentials are furthermore used in the investigation of basic functions of [[visual perception]].
The term "visual evoked potential" is used interchangeably with "visually evoked potential". It usually refers to responses recorded from the [[Occipital lobe|occipital]] [[cerebral cortex|cortex]]. Sometimes, the term "visual evoked cortical potential" (VECP) is used to distinguish the VEP from [[retina]]l or subcortical potentials. VEPs are also sometimes used to determine if someone is [[welfare fraud|fraudulently]] alleging blindness.
The '''[[multifocal technique|multifocal]] VEP''' is used to record separate responses for visual field locations.
Some specific VEPs are:
* '''Sweep visual evoked potential'''
* '''Binocular visual evoked potential'''
* '''Chromatic visual evoked potential'''
* '''Hemi-field visual evoked potential'''
* '''Flash visual evoked potential'''
* '''LED Goggle visual evoked potential'''
* '''Motion visual evoked potential'''
* [[Multifocal visual evoked potential]]
* '''Multi-channel visual evoked potential'''
* '''Multi-frequency visual evoked potential'''
* '''Stereo-elicited visual evoked potential'''
== See also ==
*[[Electroencephalography]]
*[[Electroretinography]]
*[[Evoked potential]]
*[[International Society for Clinical Electrophysiology of Vision]]
==References==
* {{cite journal |author=Odom JV, Bach M, Barber C, ''et al'' |title=Visual evoked potentials standard (2004) |journal=Documenta ophthalmologica. Advances in ophthalmology |volume=108 |issue=2 |pages=115–23 |year=2004 |pmid=15455794 |doi= |url=http://www.iscev.org/standards/pdfs/vep-standard-2004.pdf}}
==External links==
* {{MeshName|Evoked+Potentials,+Visual}}
[[Category:Evoked potentials]]
[[Category:Electroencephalography]]
[[Category:Ophthalmology]]
[[Category:Medical tests]]
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