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An abnormally increased level of alertness symptomatic of post-traumatic stress disorder.

Example: Any unexpected sound or movement draws the patient’s apprehensive attention. As you talk, the patient’s eyes continually scan the room.

APA Reference
Grinnell, R. (2016). Hypervigilance. Psych Central. Retrieved on May 24, 2018, from https://psychcentral.com/encyclopedia/hypervigilance/