Encyclopedia of Color Science and Technology

2016 Edition
| Editors: Ming Ronnier Luo

Visual Evoked Potentials

  • Neil ParryEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-8071-7_107



The visual evoked potential (VEP) is a means of extracting from the spontaneous electrical activity in the brain, electrical changes that are directly related to a specific brain action. It is a means of analyzing the Electroencephalogram (EEG). The event-related information (“signal”) is extracted from the overall electrical activity (“noise”) by some form of correlation. Usually, repeated samples of EEG are triggered by a particular event (e.g., an abrupt visual change) and averaged together. Because this event causes a particular type of brain response, at a predictable time, the process of averaging these time locked responses accentuates the event-related signal and smoothes out any uncorrelated activity. By using a stimulus that only contains time-locked changes in color, the VEP can provide an indirect measure of color information processing in the brain.

Scalp-Recorded Electrical Signals from the Brain

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© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Vision Science CentreManchester Royal Eye Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science CentreManchesterUK
  2. 2.Centre for Ophthalmology and Vision Sciences, Institute of Human DevelopmentUniversity of ManchesterManchesterUK