Visual evoked potential 661412 220782438 2008-06-21T15:34:30Z DOI bot 6652755 Citation maintenance. You can [[WP:DOI|use this bot]] yourself! Please [[User:DOI_bot/bugs|report any bugs]]. {{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]] [[de:Visuell evoziertes Potential]] [[no:VEP]] [[sv:VEP]]