"Reality" of near-death-experience memories: evidence from a psychodynamic and electrophysiological integrated study
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Plain English Summary
People who have had near-death experiences insist those memories feel absolutely real -- and this small study suggests their brains agree. Researchers compared ten NDE experiencers with ten controls, asking them to recall real memories, NDE memories, or imagined events while hooked up to EEG brain scanners. NDE memories scored just as detailed as real ones, and significantly more vivid than imagined ones. But the brain activity told a different story: NDE recall activated slower brainwaves (delta and theta), while ordinary memories used faster alpha and gamma waves. So NDE memories feel real but the brain processes them through a distinctly different pathway. The sample was tiny at 20 people, but this was the first study combining hypnosis with EEG in NDE research, offering tantalizing evidence for that "realer than real" quality.
Actual Paper Abstract
The nature of near-death-experiences (NDEs) is largely unknown but recent evidence suggests the intriguing possibility that NDEs may refer to actually "perceived," and stored, experiences (although not necessarily in relation to the external physical world). We adopted an integrated approach involving a hypnosis-based clinical protocol to improve recall and decrease memory inaccuracy together with electroencephalography (EEG) recording in order to investigate the characteristics of NDE memories and their neural markers compared to memories of both real and imagined events. We included 10 participants with NDEs, deο¬ned by the Greyson NDE scale, and 10 control subjects without NDE. Memories were assessed using the Memory Characteristics Questionnaire. Our hypnosis-based protocol increased the amount of details in the recall of all kind of memories considered (NDE, real, and imagined events). Findings showed that NDE memories were similar to real memories in terms of detail richness, self-referential, and emotional information. Moreover, NDE memories were signiο¬cantly different from memories of imagined events. The pattern of EEG results indicated that real memory recall was positively associated with two memory-related frequency bands, i.e., high alpha and gamma. NDE memories were linked with theta band, a well-known marker of episodic memory. The recall of NDE memories was also related to delta band, which indexes processes such as the recollection of the past, as well as trance states, hallucinations, and other related portals to transpersonal experience. It is notable that the EEG pattern of correlations for NDE memory recall differed from the pattern for memories of imagined events. In conclusion, our ο¬ndings suggest that, at a phenomenological level, NDE memories cannot be considered equivalent to imagined memories, and at a neural level, NDE memories are stored as episodic memories of events experienced in a peculiar state of consciousness.
Research Notes
Extends Thonnard et al. (2013) by adding EEG evidence to phenomenological findings. First study integrating hypnosis protocol with EEG in NDE research. Supports 'realer than real' characterization with objective neural data while remaining theoretically neutral. Small sample (N=20) is main limitation. Directly relevant to consciousness survival debate and memory research in NDEs.
This study investigated whether NDE memories are phenomenologically and neurally distinct from imagined event memories. Ten NDE experiencers (Greyson scale β₯7) and 10 matched controls recalled real and target memories (NDE or imagined) before and after hypnotic induction. Memory Characteristics Questionnaire assessed phenomenology; 32-channel EEG recorded neural activity during recall across delta, theta, alpha, beta, and gamma bands. NDE memories showed similar detail richness to real memories and significantly more than imagined memories (p=0.021). NDE recall uniquely correlated with delta (2-3 Hz) and theta (3.5-6 Hz) band power, whereas real memories correlated with high alpha and gamma bands. Hypnosis significantly increased memory detail across all conditions (all p < 0.02). Findings suggest NDE memories are stored as episodic memories of events experienced in a peculiar state of consciousness, phenomenologically indistinguishable from real memories but with distinct neural markers.
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π Cite this paper
Palmieri, Arianna, Calvo, Vincenzo, Kleinbub, Johann R, Meconi, Federica, Marangoni, Matteo, Barilaro, Paolo, Broggio, Alice, Sambin, Marco, Sessa, Paola (2014). "Reality" of near-death-experience memories: evidence from a psychodynamic and electrophysiological integrated study. Frontiers in Human Neuroscience. https://doi.org/10.3389/fnhum.2014.00429
@article{palmieri_2014_reality_nde,
title = {"Reality" of near-death-experience memories: evidence from a psychodynamic and electrophysiological integrated study},
author = {Palmieri, Arianna and Calvo, Vincenzo and Kleinbub, Johann R and Meconi, Federica and Marangoni, Matteo and Barilaro, Paolo and Broggio, Alice and Sambin, Marco and Sessa, Paola},
year = {2014},
journal = {Frontiers in Human Neuroscience},
doi = {10.3389/fnhum.2014.00429},
}