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Br J Psychiatry. 1996 Jan;168(1):110-5.

Classification of veterans with post-traumatic stress disorder using visual brain evoked P3s to traumatic stimuli.

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  • 1Institute for Noise Hazards Research, I.D.F., Medical Corps, Chaim-Sheba Medical Center, Israel.



Post-traumatic stress disorder (PTSD) typically involves a re-experiencing of traumatic events. In a previous P3 study it was found that PTSD patients react both selectively and involuntarily to combat-related pictures, exhibiting augmented P3 event-related potentials and thus providing a brain activity measure. The clinical application of these findings in differentiating PTSD patients from controls was tested.


Twenty Israeli combat veterans suffering from PTSD and 20 age-matched veterans without PTSD were evaluated. P3 potentials were recorded at Pz and Cz in response to visual motor-task target stimuli (pictures of domestic animals), non-target probe stimuli (combat-related pictures), and non-target irrelevant stimuli (pictures of furnishings and flowers).


Using the Fisher Linear Discrimination Method the P3 measures correctly classified 90% of the PTSD patients and 85% of the controls.


Visual P3s recorded in response to combat-related pictorial stimuli may introduce an efficient tool for studying higher brain activity in PTSD, complementing other behavioural and psychophysiological measurements.

[PubMed - indexed for MEDLINE]
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