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.
Grinnell, R. (2018). Aura. Psych Central. Retrieved on March 20, 2018, from https://psychcentral.com/encyclopedia/aura/