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Medical Term:


Pronunciation: flash'bak


  1. An involuntary recurrence of some aspect of a hallucinatory experience or perceptual distortion occurring some time after ingestion of the hallucinogen that produced the original effect and without subsequent ingestion of the substance.
  2. In posttraumatic stress disorder (q.v.), the sensations resulting from strong emotional sequences acting as triggers.
© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.