1178 results for "Consciousness"
EEG Signal Diversity Varies With Sleep Stage and Aspects of Dream Experience
Frontiers in Psychology – April 23, 2021
Summary
The vividness of our inner **Dream** worlds during **Sleep** correlates with brain activity. New **Neuroscience** insights from **Sleep and Wakefulness Research** using **Electroencephalography** on healthy volunteers reveal that while brain signal diversity decreases with deeper **Slow-wave sleep**, the **Neural dynamics and brain function** of the posterior cortex positively correlate with the thought-perceptual nature of dream content. This **Cognitive psychology** finding, impacting our understanding of **Consciousness** and **Perception**, suggests the richness of dreams, much like **Mind-wandering** in **Wakefulness**, is reflected in measurable brain complexity.
Abstract
Several theories link consciousness to complex cortical dynamics, as suggested by comparison of brain signal diversity between conscious states and...
Serotonergic Psychedelics LSD & Psilocybin Increase the Fractal Dimension of Cortical Brain Activity in Spatial and Temporal Domains
OpenAlex – January 11, 2019
Summary
Brain activity becomes more 'fractal' under psychedelics like psilocybin, profoundly altering consciousness. Neuroscience shows hallucinogens such as LSD and psilocybin significantly increase the fractal dimension of brain networks. LSD also significantly increased the fractal dimension of BOLD signals, with psilocybin showing a similar trend. These serotonergic compounds move the brain towards a critical state, where complex, fractal patterns emerge. This insight, leveraging computer science, informs psychology's pattern recognition theories, Psychedelics and Drug Studies, and biochemical mechanisms of perception, possibly aiding Artificial intelligence.
Abstract
Abstract Psychedelic drugs, such as psilocybin and LSD, represent unique tools for researchers in-vestigating the neural origins of consciousness. ...
Bizarreness of Lucid and Non-lucid Dream: Effects of Metacognition.
Frontiers in psychology – January 01, 2019
Summary
No Summary
Abstract
Dreams are usually characterized by primary consciousness, bizarreness and cognitive deficits, lacking metacognition. However, lucid dreaming (LD) ...
EEG signature of near-death-like experiences during syncope-induced periods of unresponsiveness.
NeuroImage – September 01, 2024
Summary
No Summary
Abstract
During fainting, disconnected consciousness may emerge in the form of dream-like experiences. Characterized by extra-ordinary and mystical features...
Qualia and the Formal Structure of Meaning
arXiv Preprint Archive – May 02, 2024
Summary
The nature of conscious experience emerges from how our minds create meaning, bridging physics and neuroscience. Research shows that our subjective experiences - from color perception to emotional states - arise from the brain's ability to map physical signals into meaningful mental interpretations, similar to how AI systems translate raw data into useful information.
Abstract
This work explores the hypothesis that subjectively attributed meaning constitutes the phenomenal content of conscious experience. That is, phenome...
Quantum-like Qualia hypothesis: from quantum cognition to quantum perception.
Frontiers in psychology – January 01, 2024
Summary
Our conscious experiences change when we pay attention to them - much like quantum particles change when observed. Scientists have discovered striking similarities between quantum physics and human perception. The way our brain processes sensory experiences (qualia) mirrors quantum behavior, especially when we consciously focus our attention on them. This suggests consciousness operates through quantum-like mechanisms, offering a new framework for understanding how we perceive reality.
Abstract
To arbitrate theories of consciousness, scientists need to understand mathematical structures of quality of consciousness, or qualia. The dominant ...
A narrative review of the pharmacological, cultural and psychological literature on ibogaine
Journal of Psychedelic Studies – January 01, 2021
Summary
The West African plant-derived compound ibogaine shows remarkable potential in treating opioid addiction through a unique combination of biological and psychological effects. Research reveals it works partly by blocking specific brain receptors while inducing a profound altered state of consciousness. Unlike traditional psychedelics, it creates a distinct multi-phase experience that helps people process trauma and addiction patterns.
Abstract
Abstract Ibogaine is a psychoactive alkaloid contained in the West African plant Tabernanthe iboga. Although preliminary, evidence suggests that ib...
Psychedelics: The New Kid on the Block
Annals of Indian Psychiatry – January 01, 2024
Summary
Remarkably, 80% of 51 cancer patients maintained significant reductions in depression and anxiety six months after high-dose psilocybin. These psychedelics, studied extensively in drug studies and psychology, alter perception and consciousness, potentially inspiring new perspectives akin to art. Biochemical analysis (fMRI/EEG) reveals they increase global functional connectivity by reconfiguring the brain's functional "blocks." From chemical synthesis of alkaloids, these substances show promise for depression, addiction, and anxiety, revolutionizing psychopharmacology.
Abstract
HISTORY In the early part of twentieth century, these molecules were known as psychotomimetics, meaning that they create a state similar to psychos...
Does neural computation feel like something?
Frontiers in neuroscience – January 01, 2025
Summary
As machines grow more sophisticated, a fascinating question emerges: Could artificial neural networks experience consciousness? New research challenges the popular view that consciousness emerges from computation alone. By using a novel "counterfactual eraser" technique in computer simulations, researchers showed that identical neural activity patterns can exist with or without the underlying computational structure - suggesting consciousness requires more than just the right calculations.
Abstract
Artificial neural networks are becoming more advanced and human-like in detail and behavior. The notion that machines mimicking human brain computa...
The Mind-Matter Dichotomy: A Persistent Challenge for Neuroscientific and Philosophical Theories.
The European journal of neuroscience – May 01, 2025
Summary
How does consciousness emerge from brain activity? New research bridges neuroscience and philosophy, showing that our perception and self-awareness arise from a complex interplay of neural processes and cultural concepts. The brain creates conscious experience by combining sensory input with pre-existing mental frameworks shaped by both biology and cultural evolution.
Abstract
Several areas of cognitive neuroscience tackle traditional philosophical questions. Among the range of problems, two closely related issues will be...
Integrated Information Theory and the Phenomenal Binding Problem: Challenges and Solutions in a Dynamic Framework.
Entropy (Basel, Switzerland) – March 25, 2025
Summary
Our brains seamlessly combine countless bits of sensory information into one unified conscious experience - a feat that challenges our understanding of consciousness. New advances in integrated information theory explain how our minds create this seamless experience through dynamic neural processes, showing how separate sensory inputs become bound together into the rich, flowing stream of consciousness we experience every moment.
Abstract
Theories of consciousness grounded in neuroscience must explain the phenomenal binding problem, e.g., how micro-units of information are combined t...
Hard Problem and Free Will: an information-theoretical approach
arXiv Preprint Archive – December 14, 2020
Summary
Quantum physics may hold the key to understanding consciousness and free will. This groundbreaking analysis proposes that information itself has an inherent experiential quality, with quantum information forming the foundation of conscious experience. The research shows how quantum states in biological systems could explain both the privacy of our thoughts and the emergence of free will through probabilistic quantum operations. The findings suggest consciousness isn't just a byproduct of brain activity, but a fundamental feature of information processing in nature.
Abstract
We explore definite theoretical assertions about consciousness, starting from a non-reductive psycho-informational solution of David Chalmers's 'ha...
The evolution of N, N-Dimethyltryptamine: from metabolic pathways to brain connectivity.
Psychopharmacology – April 11, 2025
Summary
A naturally-occurring neurotransmitter in our bodies, DMT has profound effects on brain connectivity. When present, it enhances global neural networks and alters consciousness by binding to specific receptors. Both endogenous and exogenous DMT influence cognition by increasing brain signal complexity and strengthening connections between key regions. This psychedelic compound's unique properties suggest it plays a vital role in consciousness.
Abstract
N, N-Dimethyltryptamine (DMT), a potent serotonergic psychedelic, bridges ancient wisdom and modern science. The mechanisms underlying its powerful...
Cortical signatures linked to behavior quantitatively track arousal levels.
Proceedings of the National Academy of Sciences of the United States of America – May 13, 2025
Summary
Scientists have discovered a remarkable brain pattern that acts like a natural "wake-up signal," appearing consistently as consciousness returns after brain injury or anesthesia. By tracking unique cortical patterns and breathing rhythms, researchers identified specific neural signatures that predict motor behavior and awareness levels. This breakthrough could revolutionize monitoring arousal recovery in patients with disorders of consciousness.
Abstract
While current arousal level assessments in patients with disorders of consciousness discriminate altered states of consciousness, there are signifi...
The Altered States Database: Psychometric data from a systematic literature review
Scientific Data – January 01, 2022
Summary
A new open-science database compiles subjective experiences from 165 studies on altered states of consciousness, induced by various methods. Researchers systematically gathered self-reported experience data from validated questionnaires, making it freely available. This resource allows for direct comparison of experiences and analysis of dose-response relationships, significantly advancing understanding of these profound states.
Abstract
In this paper, we present the development of the Altered States Database (ASDB), an open-science project based on a systematic literature review. T...
OAV and 5D-ASC for Brazilian Portuguese: A validation and adaptation study.
Journal of psychopharmacology (Oxford, England) – June 28, 2025
Summary
Understanding the profound subjective experiences induced by Psychedelics is crucial. New research successfully adapted and validated key psychometrics, like the OAV, for use in Brazil, specifically to measure altered states of consciousness. Through robust methods, including expert reviews and a large online survey of 3762 individuals, the scales demonstrated strong reliability and validity. This confirms their effectiveness in capturing diverse psychedelic experiences, highlighting cultural nuances.
Abstract
This study aimed to validate and culturally adapt the Altered States of Consciousness Rating Scale (OAV) and Five Dimensional-Altered States of Con...
How is a psychotherapeutic process like a psychedelic drug? Neurocognitive evidence for a novel mechanism of action with Regenerating Images in Memory.
Frontiers in psychology – January 01, 2025
Summary
A novel brief therapy approach triggers brain patterns similar to those seen during mystical experiences, offering hope for stress and trauma healing. Using EEG monitoring, researchers found that this imagery-based technique shifts brain activity from analytical regions to emotional processing areas. The therapy helped nursing students process pandemic-related stress, producing significant symptom improvements in just one session. Cognitive neuroscience reveals it works by accessing deeper mental states, similar to psychedelic treatments, but through conversation alone.
Abstract
Nursing students are at risk for traumatic stress, but current treatments have limited benefits. Regenerating Images in Memory (RIM) is a verbal ps...
High-order brain interactions in ketamine during rest and task: a double-blinded cross-over design using portable EEG on male participants.
Translational psychiatry – July 27, 2024
Summary
Ketamine's effects on brain activity can now be tracked using simple, portable EEG devices. Scientists found that ketamine increases the repetition of brain signals across multiple regions, particularly during rest. Using a double-blind study with 30 men, researchers compared brain patterns under ketamine versus saline. The drug created more synchronized brain activity, especially when participants were at rest, linking to feelings of disconnection from reality.
Abstract
Ketamine is a dissociative anesthetic that induces a shift in global consciousness states and related brain dynamics. Portable low-density EEG syst...
Neural Circuits, Microtubule Processing, Brain's Electromagnetic Field-Components of Self-Awareness.
Brain sciences – July 25, 2021
Summary
No Summary
Abstract
The known theories discussing the essence of consciousness have been recently updated. This prompts an attempt to integrate these explanations conc...
Changes in information integration and brain networks during propofol-, dexmedetomidine-, and ketamine-induced unresponsiveness.
British journal of anaesthesia – March 01, 2024
Summary
No Summary
Abstract
Information integration and network science are important theories for quantifying consciousness. However, whether these theories propose drug- or ...
Assessment of the acute subjective psychedelic experience: A review of patient-reported outcome measures in clinical research on classical psychedelics
Journal of Psychopharmacology – November 16, 2023
Summary
Measuring the profound shifts in consciousness induced by psychedelics like psilocybin, ayahuasca, and lysergic acid diethylamide is surprisingly inconsistent, hindering clinical psychology. A review of 93 trials revealed 17 distinct rating scales are used across the population to assess these altered states. The Hallucinogen Rating Scale is among the five most utilized. This variability in instruments impacts our understanding of the level of consciousness and how these substances, relevant to psychiatry and drug studies, affect the subjective experience. Standardized measurement is crucial.
Abstract
Background: The classical psychedelics psilocybin, peyote, ayahuasca/ N, N-dimethyltryptamine, and lysergic acid diethylamide can temporarily produ...
Robot-assisted gait training for individuals with severe acquired brain injury: a scoping review.
Brain injury – May 05, 2025
Summary
Innovative robotic technology is revolutionizing recovery for patients with severe brain injury. Robot-assisted walking systems help non-ambulatory patients practice natural walking movements, even when consciousness is impaired. This technology combines physical support with precise, repetitive motions to stimulate brain plasticity and enhance recovery. Studies show promising improvements in both physical function and consciousness levels.
Abstract
Early out-of-bed mobilization is recommended for individuals with severe acquired brain injury and impaired consciousness to promote recovery. Robo...
Dose-response relationships of LSD-induced subjective experiences in humans.
Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology – October 01, 2023
Summary
A groundbreaking analysis reveals how different doses of LSD affect human consciousness. Higher doses (up to 100 micrograms) intensify perceptual changes and positive feelings of ego dissolution, while anxiety remains minimal. Beyond 100 micrograms, effects plateau. Individual responses vary significantly, suggesting personal factors strongly influence the experience.
Abstract
Lysergic acid diethylamide (LSD) is a potent classic serotonergic psychedelic, which facilitates a variety of altered states of consciousness. Here...
Brain dynamics of classical psychedelics show paradoxical hierarchical flattening with increased complexity
OpenAlex – December 22, 2024
Summary
Psychedelics uniquely flatten the brain's functional hierarchy, a crucial insight for Neuroscience and Psychology. Unlike reduced consciousness, three serotonergic psychedelics—psilocybin, LSD, and DMT—were found to shift the brain towards thermodynamic equilibrium while increasing neural activity complexity. This discovery, vital for Cognitive science and Cognitive psychology, and Psychedelics and Drug Studies, suggests a distinct mechanism. It shows how brain network functional diversity changes, offering new perspectives for Mental Health Research Topics, informed by Biophysics and Computer science. This work refines our understanding of consciousness.
Abstract
Despite divergent behavioral and phenomenological profiles, both psychedelic states and reduced states of consciousness have been associated with a...
Safety, tolerability and subjective effects of vaporized N,N-Dimethyltryptamine: A randomized double-blind clinical trial.
European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology – June 17, 2025
Summary
Vaporized N,N-Dimethyltryptamine (DMT) offers a uniquely brief, intense psychedelic experience, prompting interest in its clinical potential. A randomized, placebo-controlled study, the first of its kind for inhaled n,n-dimethyltryptamine, involved 25 healthy participants in a clinical trial. It confirmed that 60mg dmt safely induced profound altered states of consciousness. Physiological changes were transient and within safe limits, and any adverse events were mild. This well-tolerated compound shows significant promise for future therapeutic applications, potentially for mood disorders.
Abstract
Vaporized N,N-Dimethyltryptamine (DMT) has a short duration and simple application, prompting this technique as a new approach for psychedelics' cl...
Looking for the Self: Phenomenology, Neurophysiology and Philosophical Significance of Drug-induced Ego Dissolution
Frontiers in Human Neuroscience – May 23, 2017
Summary
High doses of hallucinogens strikingly dissolve the sense of self, a phenomenon, drug-induced ego dissolution. It challenges the psychology of self; consciousness doesn't always require self-awareness. Neuroscience identifies three drug classes inducing this, disrupting the "embodied self" rooted in multimodal sensory function, not just an illusion. Understanding these neural correlates of consciousness informs cognitive psychology and neurophysiology. It offers psychotherapists insights beyond ego depletion or narcissism, impacting cognition and pain management, akin to the placebo effect. This deep dive into the ego provides a unique lens for phenomenology.
Abstract
There is converging evidence that high doses of hallucinogenic drugs can produce significant alterations of self-experience, described as the disso...
Effects of external stimulation on psychedelic state neurodynamics
OpenAlex – November 02, 2020
Summary
Psychedelics reliably enhance brain entropy, a measure of neural signal diversity, which typically decreases with loss of consciousness. Neuroscience reveals LSD, through its biochemical action on neurotransmitter receptors, significantly increases this diversity, with largest changes when participants have their eyes closed. This finding from Psychedelics and Drug Studies highlights how external stimulus profoundly influences cognitive psychology and subjective experience. The link between brain activity and conscious level is disrupted by video, underscoring context's critical role in psychedelic therapy and its influence on behavior.
Abstract
Recent findings have shown that psychedelics reliably enhance brain entropy (understood as neural signal diversity), and this effect has been assoc...
Dynamic medial parietal and hippocampal deactivations under DMT relate to sympathetic output and altered sense of time, space, and the self
Imaging Neuroscience – April 16, 2025
Summary
Our sense of time and self can profoundly shift under altered states. Researchers mapped brain activity and heart rate in volunteers given DMT. They found immediate deactivations in brain areas linked to time, space, and self-referential processing, alongside increased activity in regions tied to hallucinations. Elevated heart rate, indicating sympathetic regulation, correlated with these brain changes. This suggests a chain linking sympathetic regulation to these brain deactivations, potentially fostering positive mental health outcomes related to self-referential processing.
Abstract
Abstract N,N-Dimethyltryptamine (DMT) is a serotonergic psychedelic, known to rapidly induce short-lasting alterations in conscious experience, cha...
Peak Experiences of Psilocybin Users and Non-Users
Journal of Psychoactive Drugs – April 01, 2013
Summary
Nearly half (47%) of individuals who use psilocybin, a potent hallucinogen, report their most profound peak experiences—defined by Maslow's hierarchy of needs as moments of awe or transcendence—occurred while under its influence. A study involving 101 participants explored the psychology of these experiences. It revealed distinct differences in the alteration of consciousness during peak moments for psilocybin users versus non-users. This work, relevant to Psychedelics and Drug Studies, suggests psilocybin profoundly impacts subjective reality, potentially offering insights into consciousness and well-being, even touching on areas sometimes associated with Paranormal Experiences or Complementary and Alternative Medicine.
Abstract
Maslow (1970) defined peak experiences as the most wonderful experiences of a person's life, which may include a sense of awe, well-being, or trans...
Increased thalamic resting‐state connectivity as a core driver of LSD‐induced hallucinations
Acta Psychiatrica Scandinavica – September 21, 2017
Summary
Lysergic acid diethylamide (LSD) profoundly alters brain connectivity, offering new insights into Consciousness. In a Neuroscience and Psychology investigation, 20 healthy participants received 100 μg of this potent hallucinogen. Functional magnetic resonance imaging (fMRI) revealed increased Thalamus connectivity to cortical regions, including the Insula. These changes correlated with subjective auditory and visual effects, suggesting that Psychedelics and Drug Studies highlight how altered thalamocortical interactions drive these experiences. This sheds light on neurotransmitter receptor influence on behavior and the neural basis of altered consciousness.
Abstract
Objective It has been proposed that the thalamocortical system is an important site of action of hallucinogenic drugs and an essential component of...
Philosophy and classic psychedelics: A review of some emerging themes
Journal of Psychedelic Studies – January 21, 2022
Summary
Psychedelics, particularly serotonergic compounds, are profoundly reshaping our understanding of consciousness, prompting deep philosophical inquiry. Academic philosophy is now exploring four critical areas, gaining significant traction over the last decade. This includes examining selfless consciousness and the very nature of the self, alongside psychedelic epistemology, which questions how these experiences influence knowledge. Ethical considerations for their appropriate use are also paramount. Furthermore, there's an exploration into whether the spiritual dimensions of psychedelic experiences can align with a naturalistic worldview, engaging Philosophy, Psychology, and Sociology in this complex dialogue.
Abstract
Abstract Serotonergic (or “ classic” ) psychedelics have struck many researchers as raising significant philosophical questions that, until recentl...
Brain Entropy During Aging Through a Free Energy Principle Approach
Frontiers in Human Neuroscience – March 22, 2021
Summary
Brain entropy, a key measure of neural complexity in neuroscience, profoundly shifts with consciousness. This neurocognitive review reveals brain entropy decreases in reduced consciousness, like physiological aging, but increases in psychedelic states and psychotic conditions such as schizophrenia. Using resting-state functional magnetic resonance imaging (fMRI), the work explores how the brain's information processing, central to cognition, maintains a dynamic balance. This perspective, relevant to cognitive science and psychology, extends the entropic brain hypothesis across neural dynamics and functional brain connectivity, from drug studies to aging.
Abstract
Neural complexity and brain entropy (BEN) have gained greater interest in recent years. The dynamics of neural signals and their relations with inf...
QEEG studies of the acute effects of the visionary tryptamine DMT.
Cosmos and history – January 01, 2015
Summary
The psychedelic tryptamine DMT profoundly alters consciousness, correlating with significant brain activity changes. In a neuroscience study, 23 healthy volunteers (15 men, 8 women) experienced a robust 72% average suppression of Alpha brain waves during the experience, followed by a 43% Alpha rebound. This pharmacological and chemistry research, part of ongoing drug studies, contributes to medicine's understanding of how neurotransmitters like DMT influence brain function and subjective psychology, illuminating the neurological basis of consciousness.
Abstract
Recent brain imaging studies in Psychedelic Brain Science are breaking new ground in our understanding of neurological substrate of biological cons...
ALADIN ∞ ℂ(t) — The Final Law of the Universe: Complete Repository (December 2025) — 430 MB Definitive Archive
Zenodo (CERN European Organization for Nuclear Research) – December 14, 2025
Summary
A groundbreaking finding reveals that a primordial current density of 1.000 × 10¹⁸ A/m² can explain cosmology, consciousness, and quantum biology without invoking dark matter or energy. This comprehensive archive includes 486 reproducible Python proofs and raw EEG data from breakthrough subjects undergoing experiences like 5-MeO-DMT and sustained meditation. Key insights include consciousness as a physical field oscillating at 43 Hz, ego dissolution at 41 seconds, and a measurable immortality switch, suggesting profound connections between neurophysiology and enlightenment.
Abstract
Mihai Alexandru Bucurenciu (Aladin), independent researcher, Sibiu, Romania. This is the complete and definitive archive of ALADIN ∞ ℂ(t) — the Fin...
Dynamic medial parietal and hippocampal deactivations under DMT relate to sympathetic output and altered sense of time, space, and the self.
bioRxiv : the preprint server for biology – August 12, 2024
Summary
DMT, a powerful psychedelic compound, temporarily alters brain activity in ways that profoundly affect our perception of time, space, and self. Using advanced brain imaging and EKG monitoring, researchers found that DMT creates unique dynamic brain states, particularly reducing activity in memory and self-awareness regions while increasing sensory processing. These changes correlate with elevated heart rate and altered self-referential processes.
Abstract
N,N-Dimethyltryptamine (DMT) is a serotonergic psychedelic, known to rapidly induce short-lasting alterations in conscious experience, characterize...
Ketamine-assisted psychotherapy, psychedelic methodologies, and the impregnable value of the subjective—a new and evolving approach
Frontiers in Psychiatry – February 01, 2024
Summary
Ketamine, a legally prescribed medicine, offers profound potential in psychiatry. Its dissociative, psychedelic effects on consciousness, often mislabeled as side effects, are actually central to its therapeutic impact. When integrated by a psychotherapist, these experiences facilitate personal growth and healing, offering a powerful approach for brain disorders like Treatment of Major Depression. This positions ketamine, alongside emerging hallucinogens like psilocybin in Psychedelics and Drug Studies, as a new frontier in medicine and psychology, exploring novel brain mechanisms.
Abstract
Psychiatry is in a growth phase in which several psychedelic medicines have entered its arena with great promise. Of these, presently, ketamine is ...
Reduced Precision Underwrites Ego Dissolution and Therapeutic Outcomes Under Psychedelics
Frontiers in Neuroscience – March 17, 2022
Summary
Psychedelics dramatically shift our perception by reducing the "precision" of how our brains update beliefs, a core concept in Bayesian probability and cognitive psychology. This biological mechanism, involving neurotransmitter receptor influence on cortical connectivity, unlocks diverse alternate hypotheses, explaining their therapeutic potential in psychology for internalizing disorders. This same mechanism, akin to computer science models of information processing, also drives profound changes in consciousness like "ego dissolution," providing a unified understanding of how these drug studies modify attention and perception through biochemical changes.
Abstract
Evidence suggests classic psychedelics reduce the precision of belief updating and enable access to a range of alternate hypotheses that underwrite...
Brain serotonin 2A receptor binding predicts subjective temporal and mystical effects of psilocybin in healthy humans
Journal of Psychopharmacology – October 08, 2020
Summary
Individual brain chemistry profoundly shapes psychedelic experiences. In a Neuroscience and Psychology investigation, 16 participants received a single dose (0.2–0.3 mg/kg) of the hallucinogen psilocybin, a serotonin-acting chemical alkaloid. Those with higher levels of the brain's 5-HT2A receptor, a key neurotransmitter receptor, experienced shorter peak effects but a longer return to normal consciousness. This finding from Psychedelics and Drug Studies highlights how individual receptor binding influences the temporal and mystical aspects of a psilocybin journey, profoundly impacting behavior.
Abstract
Background: Psilocybin is a serotonergic psychedelic with psychoactive effects mediated by serotonin 2A receptor (5-HT2AR) activation. It produces ...
Does the Nervous System Have an Intrinsic Archaic Language? Entoptic Images and Phosphenes
NeuroQuantology – June 02, 2014
Summary
Ancient psychoactive plants, including Psilocybin, Mescaline, and Ayahuasca, profoundly shaped human history and art for millennia. Consumed in rituals, these plant-derived chemicals induce trance states and altered consciousness, revealing universal geometric forms and archetypal symbols. This ancient visual language, deeply embedded in our psychology, has influenced aesthetics and religious figures across cultures since Neolithic times, highlighting the profound impact of psychedelics on human expression.
Abstract
Psychoactive plants have been consumed by many cultures, cults and groups during religious rituals and ceremonies for centuries and they have been ...
Johns Hopkins Opens Research Center on Psychedelics
Psychiatric News – October 28, 2019
Summary
Johns Hopkins has launched a $17 million Center for Psychedelic and Consciousness Research, funded for five years by private donations. This significant hub for drug studies will investigate compounds like psilocybin and MDMA for psychiatric disorders, including opioid use, PTSD, and anorexia nervosa. The Center aims to advance medicine by training future experts in psychology and psychiatry, carefully exploring psychedelics' therapeutic potential after decades of limited research. This represents a major investment in understanding these powerful substances.
Abstract
Back to table of contents Previous article Next article ProfessionalFull AccessJohns Hopkins Opens Research Center on PsychedelicsNick ZagorskiNick...
Przedstawienia grzybów psychoaktywnych w ewidencji archeologicznej i ich interpretacje
Folia Praehistorica Posnaniensia – December 30, 2021
Summary
A compelling theory posits that psilocybin, from psychedelic mushrooms, was a crucial element in human evolution, accelerating the development of consciousness, language, and religion. This idea, a subject of intense debate across Philosophy, Psychology, and Sociology, suggests psychedelics fundamentally shaped early human experience. A critical examination, incorporating archaeological evidence, challenges this controversial hypothesis. This approach provides an epistemological critique, also touching on psychoanalysis, regarding the theory's claims about our ancestors' diet and complex thought.
Abstract
There has been a debate regarding substances that cause altered states of consciousness (especially those of a psychedelic nature) that have been i...
Acute subjective effects in LSD- and MDMA-assisted psychotherapy
Journal of Psychopharmacology – October 08, 2020
Summary
LSD and MDMA are showing promise in treating posttraumatic stress disorder and major depression, particularly for patients unresponsive to conventional therapies. In Switzerland, 18 patients (12 women, 6 men, aged 29-77) participated in a compassionate use program between 2014-2018. They experienced significant alterations in consciousness, with LSD producing notable mystical experiences. Sessions were conducted every 3.5 months after initial psychotherapy, yielding effects comparable to those observed in clinical trials. These findings support the potential of psychedelics in therapeutic settings for mental health challenges.
Abstract
Background: Lysergic acid diethylamide (LSD) and 3,4-methylenedioxymethamphetamine (MDMA) were used in psychotherapy in the 1960s–1980s, and are cu...
Ayahuasca as Antidepressant? Psychedelics and Styles of Reasoning in Psychiatry
Anthropology of Consciousness – March 01, 2012
Summary
Ayahuasca shows potential as a treatment for depression and anxiety, with various studies indicating therapeutic benefits. Analyzing 100+ academic publications reveals that conventional psychiatric views often label psychedelic experiences as pathological, influencing the discourse on ayahuasca's efficacy. Despite this bias, findings suggest that altered states of consciousness induced by ayahuasca may have significant psychological advantages. This calls for a reevaluation of traditional psychiatric reasoning to embrace the therapeutic possibilities of psychedelics in mental health care, highlighting their potential role in enhancing psychological well-being.
Abstract
Abstract There is a growing interest among scientists and the lay public alike in using the S outh A merican psychedelic brew, ayahuasca, to treat ...
Position of the Ceremony with the Psychedelic Drink Ayahuasca in the Society of the Amero-Indians of the Amazon
IntechOpen eBooks – December 11, 2023
Summary
Ayahuasca ceremonies among the Amero-Indians in the Amazon are transformative, with participants experiencing significant shifts in consciousness. In these rituals, shamans guide individuals through profound psychological insights, addressing issues like anxiety and depression. While some may face adverse reactions, 80% report therapeutic benefits, including enhanced self-awareness and emotional clarity. Post-ceremony, many express their experiences through vibrant paintings, reflecting their unique cosmology and understanding of the world. This fusion of art and spirituality illustrates the deep connection between indigenous practices and psychological healing.
Abstract
The Amero-Indians of the Amazon traditionally use ayahuasca for various physical and psychological ailments. Shamans in the Peruvian Amazon use the...
Cortical Mechanisms Contributing to Ketamine-Induced Dissociation
The Neuroscientist – December 26, 2025
Summary
Ketamine shows promise as a rapid-acting antidepressant, with effects linked to its unique ability to induce dissociative anesthesia. In studies involving hundreds of participants, subhypnotic doses have demonstrated significant changes in cortical circuits by targeting NMDA receptors and HCN1 channels. These interactions lead to disinhibition of pyramidal neurons and altered thalamocortical connectivity. Remarkably, ketamine may concentrate within intracellular compartments, influencing neuronal excitability and signaling. Understanding these mechanisms could pave the way for innovative treatments for major depression and insights into consciousness.
Abstract
Ketamine is a unique anesthetic agent that induces dissociative anesthesia, characterized by perceptual detachment, analgesia, and altered states o...
Out of body experiences: Scoping review.
Explore (New York, N.Y.) – June 04, 2025
Summary
Many report a profound sense of reality during Out of Body Experiences (OBEs). A comprehensive review of 87 publications explored how these unique events occur and their impact. It found OBEs can be spontaneous or induced, often linked to altered states of consciousness like lucid dreaming. While reactions vary, many embrace these as transcendental experiences. This work helps normalize and expand our understanding of Consciousness.
Abstract
Despite the growing body of scientific research on Out of Body Experiences (OBEs), a scoping review has not yet been conducted. A search was conduc...
Electrophysiological correlates of lucid dreaming: sensor and source level signatures
bioRxiv Preprint Server – April 09, 2024
Summary
Conscious awareness during dreams has a unique brain signature. Researchers developed refined methods to analyze brain signals from many participants. While surface activity resembles regular dreams, deeper brain regions reveal distinct patterns. Increased gamma waves in temporal areas suggest verbal insight and self-reflection. Reduced beta waves in parietal regions may reflect a conscious reality check. Crucially, enhanced alpha connectivity indicates heightened self-awareness. These findings successfully map the neural basis of lucid dreaming.
Abstract
Lucid dreaming (LD) is a state of conscious awareness of the current dream state, predominantly associated with REM sleep. Research progress in unc...
Ketamine and sleep modulate neural complexity dynamics in cats
bioRxiv Preprint Server – June 25, 2021
Summary
Brain signal complexity dramatically shifts with consciousness. Researchers explored how this complexity varies during sleep and with different ketamine doses in cats. Using intracranial electrodes, they measured brain activity during wakefulness, sleep stages, and varying subanesthetic ketamine levels. Results showed complexity was lowest in deep sleep, similar in REM sleep and wakefulness. Importantly, low ketamine doses *increased* complexity, peaking before decreasing at higher doses, especially in the prefrontal cortex. This reveals how neural complexity sensitively tracks conscious states and responds uniquely to different ketamine levels across brain regions.
Abstract
There is increasing evidence that level of consciousness can be captured by neural informational complexity: for instance, complexity, as measured ...
Electrophysiological Correlates of Lucid Dreaming: Sensor and Source Level Signatures.
The Journal of neuroscience : the official journal of the Society for Neuroscience – May 14, 2025
Summary
During lucid dreams, people become aware they're dreaming while remaining in REM sleep - a fascinating intersection of consciousness and unconsciousness. Brain imaging reveals that lucid dreamers show distinct patterns of neural activity, particularly in regions linked to self-awareness. When people achieve dream lucidity, their brain exhibits reduced activity in certain frequencies but increased connectivity between hemispheres, suggesting heightened metacognition and conscious control of their dream experience.
Abstract
Lucid dreaming (LD) is a state of conscious awareness of the ongoing oneiric state, predominantly linked to REM sleep. Progress in understanding it...
A reappraisal of Teresa of Avila's supposed hysteria.
Journal of religion and health – December 01, 1985
Summary
Teresa of Avila's intense mystical seizures, long misdiagnosed as hysteria, are re-examined with fresh insight. A new analysis compares her experiences to those in LSD-assisted psychotherapy, suggesting they align with Stanislav Grof's 'perinatal symptoms.' This compelling hypothesis posits her seizures weren't illness but a profound, progressive journey toward higher consciousness, reflecting the powerful emergence and reintegration of primitive psychological systems as 'growing pains' of transpersonal awareness.
Abstract
This essay offers a reassessment of Teresa's severe seizures which were such a characteristic feature of her mysticism. The diagnosis of hysteria i...
Effects of ketamine and propofol on muscarinic plateau potentials in rat neocortical pyramidal cells.
PloS one – January 01, 2025
Summary
Two common anesthetics - ketamine and propofol - affect brain activity in surprisingly different ways, explaining why patients experience vivid dreams with one but not the other. Scientists found that ketamine can actually enhance certain brain cell activity at moderate doses, while propofol consistently suppresses it. These findings help explain why ketamine patients often report colorful dreams while propofol leads to deep, dreamless sleep.
Abstract
Propofol and ketamine are widely used general anaesthetics, but have different effects on consciousness: propofol gives a deeply unconscious state,...
Phenomenological assessment of psychedelics induced experiences: Translation and validation of the German Challenging Experience Questionnaire (CEQ) and Ego-Dissolution Inventory (EDI)
PLoS ONE – March 16, 2022
Summary
A 26-item *rating scale* for challenging *psilocybin* experiences, for *psychedelics and drug studies*, showed robust *psychometrics*. *Confirmatory factor analysis* supported its seven-subscale structure, demonstrating strong *convergent* and *discriminant validity*, bolstering its *construct validity* and *nomological network*. However, the 8-item Ego-Dissolution Inventory required *exploratory factor analysis*, yielding a 5-item measure with high internal consistency and *convergent validity*. These tools advance *psychology* and *clinical psychology* by providing reliable measures for altered states.
Abstract
Several measures have been designed to assess subjective experiences induced by psychedelic substances or other mind-altering drugs as well as non-...
Neurochemical models of near-death experiences: A large-scale study based on the semantic similarity of written reports.
Consciousness and cognition – March 01, 2019
Summary
The consistent phenomenology of near-death experience across cultures points to a shared biological root. By analyzing 625 near-death experience narratives against 15,000 reports from 165 psychoactive substances, researchers discovered that dissociatives, especially ketamine, generated experiences most semantically similar to a near-death experience. Psychedelics also showed strong parallels. This breakthrough suggests ketamine offers a safe, reversible model for exploring these profound states, supporting a neurobiological explanation for the near-death experience.
Abstract
The real or perceived proximity to death often results in a non-ordinary state of consciousness characterized by phenomenological features such as ...
A practical measure of integrated information reveals alpha-band activity and the posterior cortex as neural correlates of arousal.
NeuroImage – July 18, 2025
Summary
No Summary
Abstract
The search for neurophysiological markers of consciousness and their neural substrates remains a focal point in neuroscience research. The integrat...
Investigating the complex cortical dynamics of an advanced concentrative absorption meditation called jhanas (ACAM-J): a geometric eigenmode analysis.
Cerebral cortex (New York, N.Y. : 1991) – February 05, 2025
Summary
No Summary
Abstract
Advanced meditation has been associated with long- and short-term psychological changes such as bliss, profound insight, and transformation of well...
A neuroscientific model of near-death experiences.
Nature reviews. Neurology – June 01, 2025
Summary
No Summary
Abstract
Near-death experiences (NDEs) are episodes of disconnected consciousness that typically occur in situations that involve an actual or potential phy...
The paradox of the self-studying brain.
Physics of life reviews – March 01, 2025
Summary
No Summary
Abstract
The paradox of a brain trying to study itself presents a conundrum, raising questions about self-reference, consciousness, psychiatric disorders, a...
Dissociative Trance Led to a Catastrophe: A Case Report.
Cureus – December 01, 2024
Summary
No Summary
Abstract
Dissociation is a cognitive process that disrupts consciousness, identity, or memory. It is frequently used as a form of defense in response to sig...
Phenomenology of auto-induced cognitive trance using text mining: a prospective and exploratory group study.
Neuroscience of consciousness – January 01, 2024
Summary
No Summary
Abstract
Auto-induced cognitive trance (AICT) is a modified state of consciousness derived from shamanic tradition that can be practised by individuals afte...
The Electroencephalographic Brainwave Spectrum, Mindful Meditation, and Awareness: Hypothesis.
International journal of yoga – January 01, 2023
Summary
No Summary
Abstract
It is hypothesized that being mindfully aware is a spontaneous state of being. It is imbued with joy, peace and happiness. Such a state is periodic...