Neural effects and phenomenology of nondual meditation and 5-MeO-DMT in an expert meditation practitioner
PsyArXiv September 30, 2025 Christopher Timmermann, Tommaso Barba, James Sanders et al. preprint
In an advanced meditator and Lama from the Mahāmudrā tradition, nondual meditation and a low dose (5 mg) of 5-MeO-DMT both produced timelessness, reduced labeling of sensory content, and diminished narrative self and thoughts. Both states showed increased alpha power and decreased gamma power in the brain, with neural overlap driven by posterior and right frontal gamma reductions. Nondual meditation uniquely emphasized recognition of nonduality and clarity of mind, while low-dose 5-MeO-DMT was characterized by visual imagery. High-dose (12 mg) 5-MeO-DMT produced sensory disconnection, seeing a 'white-light', and broad increases in gamma power. The findings suggest two distinct routes to self-dissolution: a 'saturation' route with increased neural firing and entropy (high-dose 5-MeO) and a 'subtractive' route with reduced firing and entropy (nondual meditation and low-dose 5-MeO).