Neurochemical models of near-death experiences: A large-scale study based on the semantic similarity of written reports

@article{Martial2019NeurochemicalMO,
  title={Neurochemical models of near-death experiences: A large-scale study based on the semantic similarity of written reports},
  author={Charlotte Martial and Helena Cassol and Vanessa Charland-Verville and Carla Pallavicini and Camila Sanz and Federico Zamberlan and Roc{\'i}o Mart{\'i}nez Vivot and Fire Erowid and Earth Erowid and Steven Laureys and Bruce Greyson and Enzo Tagliazucchi},
  journal={Consciousness and Cognition},
  year={2019},
  volume={69},
  pages={52-69}
}

Figures from this paper

Semiology and Mechanisms of Near-Death Experiences

TLDR
Recent prospective studies confirm that NDEs reflect a spectrum of highly distinctive memories which are associated with negative or positive emotions and can be influenced by the nature of the causal event, but the temporal sequence with which these images unfold is variable.

Language as a Window Into the Altered State of Consciousness Elicited by Psychedelic Drugs

Psychedelics are drugs capable of eliciting profound alterations in the subjective experience of the users, sometimes with long-lasting consequences. Because of this, psychedelic research tends to

Near-Death Experiences (NDEs) in the Context of Contemporary Science and Historical Speculation and Doctrine

In medicine, life-saving procedures have advanced, resulting in more critical-condition patients being revived from a near-death state—spawning research interest in the near-death experience (NDE).

Near-Death Experience as a Probe to Explore (Disconnected) Consciousness

Natural Language as a Window into the Subjective Effects and Neurochemistry of Psychedelic Drugs

Psychedelics are drugs capable of eliciting profound alterations in the subjective experience of the users, sometimes with long-lasting consequences. Because of this, psychedelic research tends to

Studying death and near-death experiences requires neuroscientific expertise.

Parnia et al. recently published suggestions for the study of death and experiences recalled in a near-death context. We have serious reservations about the authors' statements. In this commentary,

The Neurology of Death and the Dying Brain: A Pictorial Essay

TLDR
The aim is to provide the reader with a thorough understanding that the boundaries within the neurology of death and the dying brain are being pushed just like everywhere else in the clinical neurosciences.

Comparison of psychedelic and near-death or other non-ordinary experiences in changing attitudes about death and dying

Both psychedelic drug experiences and near-death experiences can occasion changes in perspectives on death and dying, but there have been few direct comparisons of these phenomena. This study

Near-Death Experience Memories Include More Episodic Components Than Flashbulb Memories

Memories of near-death experiences (NDEs) are recalled as “realer” than memories of other real or imagined events. Given their rich phenomenology, emotionality and consequentiality, it was

References

SHOWING 1-10 OF 191 REFERENCES

DMT Models the Near-Death Experience

TLDR
A significant overlap in nearly all of the NDE phenomenological features is found when comparing DMT-induced NDEs with a matched group of ‘actual’ NDE experiencers, and a striking similarity between these states that warrants further investigation is revealed.

The Experience Elicited by Hallucinogens Presents the Highest Similarity to Dreaming within a Large Database of Psychoactive Substance Reports

TLDR
Novel quantitative analyses are applied to a large volume of empirical data to confirm the hypothesis that, among all psychoactive substances, hallucinogen drugs elicit experiences with the highest semantic similarity to those of dreams.

Response to Commentaries on "The Ketamine Model of the Near-Death Experience ..."

TLDR
The possible evolutionary advantage of the NDE mechanism is discussed, which suggests that altered states of consciousness do not require a normally functioning brain and may involve similar mechanisms to NDEs and dream sleep.

Classic Hallucinogens and Mystical Experiences: Phenomenology and Neural Correlates.

TLDR
A functional neural model of mystical experience is proposed, based on changes in the default mode network of the brain that have been observed after the administration of classic hallucinogens and during meditation practices for which mystical-type claims have been made.

Near-Death-Like Experiences without Life-Threatening Conditions or Brain Disorders: A Hypothesis from a Case Report

TLDR
This is a report on a case with most of the features typical of NDEs except that it occurred entirely without any life-threatening conditions, suggesting that a broader interpretation of the phenomenon is needed.

Near-death experiences in cardiac arrest survivors.

  • C. French
  • Psychology
    Progress in brain research
  • 2005

Using Computational Linguistics to Understand Near-Death Experiences: Concurrent Validity for the Near Death Experience Scale

Latent semantic analysis—a technique to quantify qualitative data—was used on a large dataset of near death experience (NDE) accounts for which a sizable portion also had scores on Greyson’s NDE

Phenomenology of Near-death Experiences: A Cross-cultural Perspective

TLDR
Compared the various descriptions of NDEs from a phenomenological perspective, there were similarities between particular cultures, which differed from typical western European experiences.

Is the Near-Death Experience Only N-Methyl-D-Aspartate Blocking?

Karl Jansen's interesting hypothesis that near-death experiences (NDEs) result from blockade of the N-methyl-D-aspartate receptor has several weaknesses. Some NDEs occur to individuals who are

Psychedelics, Meditation, and Self-Consciousness

TLDR
This article discusses available evidence regarding convergences and differences between phenomenological and neurophysiological data on meditation practice and psychedelic drug-induced states, and proposes that self-consciousness may be best construed as a multidimensional construct, and that “self-loss” can take several forms.
...