Remembering near-death experiences and mystical experiences produces significant functional changes in the autonomic nervous system, as measured by heart rate variability. Using continuous electroencephalography with electrocardiogram monitoring, researchers compared the memories of two groups of participants. The method allowed continuous assessment of heart rate and heart rate variability during recall. The findings demonstrate that both types of experiences are associated with measurable autonomic shifts, confirming earlier reports of such changes.
Memories of near-death experiences (NDE) and spiritual contemplative experiences (SCE) show similar brain activation patterns in delta, alpha, and gamma bands, along with frontal lobe activation, as measured by quantitative electroencephalography tomography. The Greyson Scale evaluation indicates a correlation between the attributes of NDE and SCE, such as cognitive timelessness, affective peace, transcendent oneness, and out-of-body sensations. SCE subjects exhibited statistically greater brain activation than NDE subjects. The study used QEEGt methodology, which incorporates MRI anatomical information to improve the precision of EEG source localization.