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Aura

A brief perceptual disturbance, such as a strange light or unpleasant smell. Can be beneficial, as they can give people advance warning before the onset of a migraine or seizure.

Example: A woman sees flashing colored lights to her left for a few minutes before the onset of a severe epileptic seizure.

Aura
APA Reference
Grinnell, R. (2018). Aura. Psych Central. Retrieved on May 24, 2018, from https://psychcentral.com/encyclopedia/aura/