Finding the Self by Losing the Self: Neural Correlates of Ego-Dissolution Under Psilocybin
Ego-disturbances have been a topic in schizophrenia research since the earliest clinical descriptions of the disorder.
Manifesting as a feeling that one’s “self,” “ego,” or “I” is disintegrating or that the border between one’s self and the external world is dissolving, “ego-disintegration” or “dissolution” is also an important feature of the psychedelic experience, such as is produced by psilocybin (a compound found in “magic mushrooms”).
Fifteen healthy subjects took part in this placebo- controlled study. Twelve-minute functional MRI scans were acquired on two occasions: subjects received an intravenous infusion of saline on one occasion (placebo) and 2 mg psilocybin on the other.
Twenty-two visual analogue scale ratings were completed soon after scanning and the first principal component of these, dominated by items referring to “ego-dissolution”, was used as a primary measure of interest in subsequent analyses. Employing methods of connectivity analysis and graph theory, an association was found between psilocybin-induced ego-dissolution and decreased functional con- nectivity between the medial temporal lobe and high-level cortical regions. Ego-dissolution was also associated with a “disintegration” of the salience network and reduced inter hemispheric communication.
Addressing baseline brain dynamics as a predictor of drug-response, individuals with lower diversity of executive network nodes were more likely to experience ego-dissolution under psilocybin. These results implicate MTL-cortical decoupling, decreased salience network integrity, and reduced inter-hemispheric communication in psilocybin-induced ego disturbance and suggest that the maintenance of “self”or “ego,” as a perceptual phenomenon, may rest on the normal functioning of these systems.
Our videos describing different aspects of what we do.
Can Magic Mushrooms Unlock Depression? | Rosalind Watts | TEDxOxford
Mendel Kaelen: Psychological & Neurophysiological Effects of Music in Combination with Psychedelics
Psychedelics: Lifting the veil | Robin Carhart-Harris | TEDxWarwick
How Do Psychedelic Drugs Work On The Brain? (Full Lecture)
Mendel Kaelen 29th June 2016
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