Brain Scans Uncover Neural Mechanisms of Self-Induced Psychedelic-like Trance

This research provides significant insights into how the human brain can consciously reorganize its expansive networks to manifest a profoundly altered, psychedelic-like reality, all without the use of chemical substances. It highlights the brain's inherent capacity for generating diverse conscious experiences.

The study also outlines the distinctive trajectory of brain alterations observed in a participant who can spontaneously and consistently enter such a state. Her experiences, marked by intricate visual phenomena and a sense of profound unity, closely align with the dynamic shifts detected in her brain activity throughout the process.

Unraveling the Brain's Self-Induced Altered States

A recent neuroimaging investigation has unveiled the intricate brain mechanisms of an individual capable of voluntarily entering a profound visionary trance state, reminiscent of psychedelic experiences but without any drug intervention. This groundbreaking case study, published in NeuroImage, tracked the brain activity of a participant over multiple sessions using functional magnetic resonance imaging (fMRI).

The findings indicate a dramatic reorganization of brain connectivity during this non-ordinary state of consciousness. Specifically, there was a noticeable reduction in connections within the visual and somatosensory networks, suggesting an inward focus of perception. Concurrently, the frontoparietal control regions, associated with cognitive control and introspection, exhibited heightened connectivity. These shifts in brain network dynamics provide a unique window into how self-induced altered states of consciousness manifest neurologically, offering valuable comparative data to drug-induced states that often confound direct observation of underlying brain mechanics.

Neurological Signatures of Transcendental Consciousness

The participant in this study, identified as AVP, possesses a rare ability to reliably and reproducibly enter a transcendental visionary state. Her experiences include vivid internal imagery, an altered sense of bodily awareness, shifts in personal agency, and a deep feeling of unity. This ability was developed intuitively from adolescence, without formal training, and refined through introspection over time. She maintained a high degree of voluntary control and temporal stability throughout the self-induced trance, while remaining fully aware of her surroundings.

During the transition into this state, fMRI data showed highly variable brain connectivity, indicating a temporary destabilization of normal network organization. Once the visionary state was fully established, overall connectivity between distinct brain networks decreased significantly. Visual and somatomotor-dorsal networks disconnected from external sensory processing, aligning with her subjective reports of internal imagery dominating and losing physical body sensation. Conversely, frontoparietal and salience networks, crucial for internal focus and cognitive control, showed increased coupling, consistent with her sustained inward attention and lucidity. The brain's activity also demonstrated a shift towards lower entropy and higher statistical complexity during the trance, reverting to baseline afterwards. These profound changes were absent in a control group merely imagining visual scenes, underscoring the unique neurological underpinnings of AVP's self-induced state.