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. Author manuscript; available in PMC: 2009 Jul 16.
Published in final edited form as: Psychopharmacology (Berl). 2007 Dec 6;199(3):421–437. doi: 10.1007/s00213-007-1019-1

Fig. 6.

Fig. 6

Context conditioning in Vietnam veterans with PTSD. Subject underwent differential aversive conditioning in which one cue was paired with a shock (CS+) and the other was not (CS−) over two experimental sessions separated by a week. Context conditioning was assessed by delivering startle stimuli at the beginning of each session, before conditioning occurred. The figure shows significant context conditioning in the PTSD (startle magnitude increased from session 1 to session 2) but not in the control group (startle magnitude habituated between session 1 and 2). This pattern of startle modulation resulted in a significant Group × Session interaction. (Adapted from Grillon & Davis 1999)