Mystical Experience & Neuroscience

The neuroscience of mystical experience began in earnest with the work of Andrew Newberg — a neuroscientist at Thomas Jefferson University who conducted SPECT imaging studies on meditating Tibetan Buddhist practitioners, praying Franciscan nuns, and practitioners of various contemplative traditions in the depths of their practice. These early studies involved very small groups (eight meditators in the best-known one) and reported changes in blood flow in attention- and orientation-related areas during meditation or prayer (Newberg et al., 2001, 2003). They were preliminary, used low-resolution imaging and have been criticised on methodological grounds, so they are best seen as suggestive rather than conclusive.

The most consistent finding is the behaviour of the Default Mode Network (DMN) — the set of brain regions (medial prefrontal cortex, posterior cingulate, precuneus, angular gyrus) that are most active during ordinary self-referential thought: planning, ruminating, mind-wandering, the internal monologue of the narrative self. During deep meditative states, mystical experiences and psychedelic-induced altered states, studies report reduced DMN activity and altered DMN connectivity (Brewer et al., 2011; Carhart-Harris et al., 2012) — a measurable decrease, not silence. Some researchers link these DMN changes to reports of ego dissolution (Lebedev et al., 2015), though the link is correlational. When the neural circuits that construct and maintain the narrative "I" go quiet, the experience of being a bounded individual separate from the rest of reality fades — and what remains is what contemplatives across traditions describe as pure awareness, presence, or the ground state of consciousness.

Under psychedelics, connectivity between brain regions that are normally functionally separated tends to increase. Brain areas that rarely communicate with each other begin exchanging information freely — producing the characteristic sense of everything being connected, of meaning infusing ordinary perception, of boundaries between self and world becoming permeable. Robin Carhart-Harris at Imperial College London found this pattern consistently in psychedelic states; evidence for similar changes in meditation and other non-pharmacological states is more mixed.

Neuroscience can identify the neural correlates of mystical experience with increasing precision — the DMN suppression, the increased connectivity, the temporal lobe activation, the gamma wave patterns. What it cannot do is answer the question that actually matters: why does this particular pattern of neural activity produce the experience it produces?

This is David Chalmers' "hard problem of consciousness" — the explanatory gap between physical processes in the brain and the subjective quality of experience. Science can explain how the brain processes information; it cannot explain why any physical process should be accompanied by experience at all, let alone by the specific character of the experiences it produces. The correlation between DMN suppression and ego dissolution is real and replicable. But the correlation does not explain why suppressing the DMN produces the felt sense of boundlessness rather than simply producing reduced self-referential thought with no experiential quality at all.

The contemplative traditions have a different framework for this question. Rather than asking why brain processes produce consciousness, they begin with consciousness as primary — as the fundamental nature of reality of which brain processes are one expression. In this framework, what neuroscience is mapping when it studies mystical states is not the cause of the experience but the brain's response to a shift in the underlying field of consciousness — a shift that the brain did not produce but that it participates in and expresses through its altered activity. The neural correlate is the footprint, not the foot.

Neither framework has definitively resolved the hard problem. The materialist account (consciousness is what brains do) struggles to explain the character and depth of mystical experience, the after-effects, and the hard problem itself. The consciousness-primary account (the brain tunes into or expresses consciousness rather than generating it) struggles to explain why brain damage disrupts consciousness, why anaesthesia eliminates it, and why there is such tight correlation between brain states and experiential states. The honest position is that the question remains genuinely open — and that this openness is itself one of the most interesting facts about consciousness.