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. 2011 Nov 1;1:8. doi: 10.1186/2045-5380-1-8

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Copyright ©2011 Linnman et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Psychophysiological interaction (PPI) analysis. The PPI analysis contrasted the unconditioned stimulus (US) versus omitted US, modeling the change in regional coupling between the seed induced by the delivery of the US. The green sphere indicates the location of (A) the putamen seed and (B) the parahippocampal seed. Group differences (trauma-exposed non-PTSD control (TENC) > PTSD) in psychophysiological interaction effects are displayed at a threshold of T > 3 on a template magnetic resonance imaging (MRI) scan.