États modifiés de la conscience : Revue systématique PRISMA et preuve de concept
Cortica December 15, 2025 Gowtham Karim Rajadurai, Cherine Fahim, Sophie Nicole et al.
A systematic review of 13 studies on self-induced cognitive trance (SICT) and related states shows consistent increases in theta brainwave power and modulations of alpha/beta bands, along with reorganizations in default mode and fronto-parietal networks, accompanied by heightened absorption, vivid mental imagery, and reduced hypervigilance. Gamma band findings were less consistent. A proof-of-concept EEG recording with three expert practitioners using a portable 5-electrode headset confirmed marked theta increases in all participants, with a clear gamma rise in only one. Theta appears to be a robust marker of trance states, while gamma modulations are more idiosyncratic. Portable EEG feasibility opens avenues for self-regulation protocols complementing trauma-focused psychotherapy.