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Converging evidence from animal models and non-clinical human studies highlights the potential to enhance fear extinction pharmacologically by inhibiting the AEA catabolic enzyme, fatty acid amide hydrolase (FAAH). However, in our randomized clinical trial (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009100), a FAAH inhibitor did no better than placebo at enhancing the response to exposure-based therapy in PTSD. Here, we used functional magnetic resonance imaging to investigate the neurobiological effects of FAAH inhibitor treatment on resting-state functional connectivity and the neural correlates of emotional processing (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200976 scanned). We found that greater symptom improvement was significantly related to lower functional connectivity between ventromedial prefrontal cortex (vmPFC) and right dorsolateral prefrontal cortex (dlPFC), as well as lower task activation of the right dlPFC. Further, we found that self-reported symptoms at the time of scan were associated with increased functional connectivity of the vmPFC and the amygdala across the cortex (mainly in the ventral attention network and sensorimotor network, respectively). However, while we confirmed that 4 weeks of FAAH inhibition significantly increased AEA, there were no significant differences in functional connectivity or task activation between treatment groups. These findings suggest that FAAH inhibition does not affect intrinsic functional connectivity or emotional task response in PTSD, and that the dlPFC may play an important role in the response to exposure-based psychotherapy.\n                  <\/jats:p>","DOI":"10.1038\/s41398-026-03864-3","type":"journal-article","created":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T08:09:36Z","timestamp":1770365376000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Functional neuroimaging of fatty acid amide hydrolase inhibition in posttraumatic stress disorder: a randomized clinical trial"],"prefix":"10.1038","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6865-5893","authenticated-orcid":false,"given":"Ryann","family":"Tansey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5972-0913","authenticated-orcid":false,"given":"Irene","family":"Perini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3391-6747","authenticated-orcid":false,"given":"Gavin N.","family":"Petrie","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6678-0570","authenticated-orcid":false,"given":"Connor J.","family":"Haggarty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4974-4815","authenticated-orcid":false,"given":"Raegan","family":"Mazurka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1012-7286","authenticated-orcid":false,"given":"Adam","family":"Yngve","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Mina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Madeleine R.","family":"Jones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hilda","family":"Engelbrektsson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1758-2206","authenticated-orcid":false,"given":"Andrea J.","family":"Capusan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew N.","family":"Hill","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2706-2482","authenticated-orcid":false,"given":"Markus","family":"Heilig","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0645-4869","authenticated-orcid":false,"given":"Leah M.","family":"Mayo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,2,6]]},"reference":[{"key":"3864_CR1","doi-asserted-by":"crossref","unstructured":"American Psychiatric Association. 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