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Multimodal neuroimaging data paired with dynamic analysis techniques offer a valuable approach for identifying unique signatures of brain activity\u2014and linked autonomic physiology\u2014naturally unfolding during the altered state of consciousness induced by DMT. We leveraged simultaneous fMRI and EKG data acquired in 14 healthy volunteers prior to, during, and after intravenous administration of DMT, and, separately, placebo. fMRI data were preprocessed to derive individual dynamic activity matrices, reflecting the similarity of brain activity in time, and community detection algorithms were applied on these matrices to identify brain activity substates; EKG data were used to derive continuous heart rate. We identified a brain substate occurring immediately after DMT injection, characterized by hippocampal and medial parietal deactivations and increased superior temporal lobe activity under DMT. Deactivations in the hippocampus and medial parietal cortex correlated with alterations in the usual sense of time, space, and self-referential processes, reflecting a deconstruction of essential features of ordinary consciousness. Superior lobe activations, instead, correlated with audio\/visual hallucinations and experience of \u201centities\u201d, reflecting the emergence of altered sensory experiences under DMT. Finally, increased heart rate under DMT correlated positively with hippocampus\/medial parietal deactivation and the experience of \u201centities\u201d, and negatively with altered self-referential processes. These results suggest a chain of influence linking sympathetic regulation to hippocampal and medial parietal deactivations under DMT, which, combined, may contribute to positive mental health outcomes related to self-referential processing following psychedelic administration.<\/jats:p>","DOI":"10.1162\/imag_a_00541","type":"journal-article","created":{"date-parts":[[2025,4,1]],"date-time":"2025-04-01T18:14:50Z","timestamp":1743531290000},"update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":1,"title":["Dynamic medial parietal and hippocampal deactivations under DMT relate to sympathetic output and altered sense of time, space, and the self"],"prefix":"10.1162","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7899-7061","authenticated-orcid":false,"given":"Lorenzo","family":"Pasquini","sequence":"first","affiliation":[{"name":"Department of Neurology, Neuroscape, University of California, San 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