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Neuroreport. 2012 Dec 19;23(18):1035-8. doi: 10.1097/WNR.0b013e32835a989e.

Neural correlates of the modified Stroop effect in post-traumatic stress disorder: an event-related potential study.

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Key Laboratory of Cognition and Personality (SWU), Ministry of Education, University of Montreal, Montreal, Quebec, Canada.


Previous studies have provided electrophysiological evidence for attentional abnormalities in patients with post-traumatic stress disorder (PTSD). The present study examined the electrophysiological activity of trauma-exposed patients with or without a PTSD during a modified Stroop task. The PTSD group showed a reduced P2 and P3 amplitude relative to the non-PTSD group under both the earthquake-related and earthquake-unrelated words conditions. Importantly, the earthquake-related words elicited a greater P3 amplitude (350-450 ms after stimulus) than did unrelated words in the non-PTSD group, whereas no significant difference was found in the PTSD group. This indicates that PTSD patients had some attention deficits compared with non-PTSD individuals, and that these attention deficits were not just limited to earthquake-related words.

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