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Connectome-harmonic decomposition of human brain activity reveals dynamical repertoire re-organization under LSD.


ABSTRACT: Recent studies have started to elucidate the effects of lysergic acid diethylamide (LSD) on the human brain but the underlying dynamics are not yet fully understood. Here we used 'connectome-harmonic decomposition', a novel method to investigate the dynamical changes in brain states. We found that LSD alters the energy and the power of individual harmonic brain states in a frequency-selective manner. Remarkably, this leads to an expansion of the repertoire of active brain states, suggestive of a general re-organization of brain dynamics given the non-random increase in co-activation across frequencies. Interestingly, the frequency distribution of the active repertoire of brain states under LSD closely follows power-laws indicating a re-organization of the dynamics at the edge of criticality. Beyond the present findings, these methods open up for a better understanding of the complex brain dynamics in health and disease.

SUBMITTER: Atasoy S 

PROVIDER: S-EPMC5732294 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature

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Connectome-harmonic decomposition of human brain activity reveals dynamical repertoire re-organization under LSD.

Atasoy Selen S   Roseman Leor L   Kaelen Mendel M   Kringelbach Morten L ML   Deco Gustavo G   Carhart-Harris Robin L RL  

Scientific reports 20171215 1


Recent studies have started to elucidate the effects of lysergic acid diethylamide (LSD) on the human brain but the underlying dynamics are not yet fully understood. Here we used 'connectome-harmonic decomposition', a novel method to investigate the dynamical changes in brain states. We found that LSD alters the energy and the power of individual harmonic brain states in a frequency-selective manner. Remarkably, this leads to an expansion of the repertoire of active brain states, suggestive of a  ...[more]

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