1178 results for "Consciousness"
State-related Electroencephalography Microstate Complexity during Propofol- and Esketamine-induced Unconsciousness.
Anesthesiology – May 01, 2024
Summary
No Summary
Abstract
Identifying the state-related "neural correlates of consciousness" for anesthetics-induced unconsciousness is challenging. Spatiotemporal complexit...
Unique effects of sedatives, dissociatives, psychedelics, stimulants, and cannabinoids on episodic memory: A review and reanalysis of acute drug effects on recollection, familiarity, and metamemory.
Psychological review – March 01, 2024
Summary
Psychoactive drugs have surprisingly distinct effects on how we remember. A reanalysis of 28 drug conditions revealed how sedatives, dissociatives, psychedelics, stimulants, and cannabinoids uniquely impact our ability to recall specific details (recollection), recognize generally (familiarity), and judge memory accuracy (metamemory) during memory formation, stabilization, and access. Sedatives *enhanced* recollection during stabilization. Stimulants *boosted* metamemory and familiarity. Psychedelics *improved* familiarity. These patterns illuminate drug-specific memory phenomena, showing how memory quantity and stability influence our confidence in what we recall.
Abstract
Despite distinct classes of psychoactive drugs producing putatively unique states of consciousness, there is surprising overlap in terms of their e...
Phenomenological assessment of psychedelic induced experiences: Translation and validation of the German Challenging Experience Questionnaire (CEQ) and Ego-Dissolution Inventory (EDI)
OpenAlex – April 02, 2021
Summary
A 26-item German scale reliably measures diverse challenging experiences induced by psychedelics, advancing clinical psychology. Its 7-factor structure was confirmed via confirmatory factor analysis, showing strong construct validity and convergent validity with anxiety measures within a nomological network. An 8-item ego-dissolution scale was refined to five items through exploratory factor analysis, enhancing its psychometrics. These validated tools, essential for psychology, will illuminate how chemical synthesis of alkaloids and their neurotransmitter receptor influence on behavior manifest as subjective states, bolstering drug studies.
Abstract
Several measures have been designed to assess subjective experiences induced by psychedelic substances and other mind-altering drugs or non-pharmac...
Electrophysiological effects of psilocybin co-administered with midazolam
OpenAlex – July 29, 2025
Summary
Imagine experiencing a profound psychedelic journey without memory of it. A pilot study in **psychedelics and drug studies** gave participants 25 mg of psilocybin—an **alkaloid** from **chemical synthesis**—with a sedative. This allowed the full psychedelic experience, blunting recall. Brain activity showed distinct patterns: initially, increased beta power; then, as psilocybin's **neurotransmitter receptor influence on behavior** grew over six hours, increased brain complexity and altered power. Psilocybin's effects persist despite memory suppression, supporting mechanistic studies.
Abstract
Abstract The serotonergic psychedelic psilocybin induces neural plasticity and profoundly alters consciousness. The benzodiazepine midazolam blunts...
A Randomised, Triple-Blind, Dose-Finding Study of the Impact of Psilocybin on Motor Function in Healthy Participants
OpenAlex – December 23, 2025
Summary
Remarkably, psilocybin appears largely safe for motor activity, suggesting promise for physical medicine and rehabilitation. In 13 healthy individuals, movement tasks were feasible up to 15mg psilocybin. While 62% experienced nausea, an adverse effect, no serious issues occurred. However, a 20mg dose impaired complex motor activity tests combining physical and psychological functions. Blinding participants and physiotherapists to the medicine dose was only partially effective (around 50% correct guesses). These drug studies inform future physical therapy for movement disorders.
Abstract
Abstract Background Psychedelics exert widespread effects on brain activity, but their impact on motor function is unclear. This is clinically rele...
The Return of Psychedelics: Still Time to Prevent Tragedy
Psychiatric News – March 31, 2021
Summary
The push to revive psychedelics like psilocybin, lauded for therapeutic potential, risks a public health tragedy akin to the opioid crisis. Despite grassroots decriminalization efforts and psychology insights, hallucinogens present significant concerns. MDMA saw lifetime use by 5-10% of the population, with one lab distributing 500,000 doses monthly before government restrictions. Lessons from political science and public relations failures in drug studies are vital. Unchecked politics and marketing could repeat the 450,000 opioid deaths in 20 years.
Abstract
Back to table of contents Previous article Next article ViewpointsFull AccessThe Return of Psychedelics: Still Time to Prevent TragedyStanley N. Ca...
The intersection of near-death experiences (NDEs) and traumatic brain injury (TBI): neurobiological, phenomenological, and creative implications.
Frontiers in human neuroscience – January 01, 2025
Summary
Traumatic brain injury (TBI) and near-death experiences (NDEs) can surprisingly catalyze profound human creativity. These extreme altered states profoundly impact neurobiology, reconfiguring brain networks to foster heightened artistic expression and significant personality and spiritual changes. Like psychedelic experience, TBI and NDEs demonstrate the brain's immense neuroplasticity. Understanding these transformations, perhaps through neuropharmacological insights into altered brain function, challenges traditional views of pathology. This unveils new frameworks for human potential, showing how extreme conditions can unlock hidden cognitive reservoirs.
Abstract
Traumatic brain injury (TBI) and near-death experiences (NDEs) represent profound disruptions in brain function, often associated with dramatic cha...
Christ returns from the jungle: Ayahuasca religion as mystical healing
Journal of Psychedelic Studies – August 16, 2024
Summary
Ayahuasca ceremonies in Europe provide vital solutions for individuals grappling with feelings of estrangement and isolation, effectively countering the secularization trend. Analyzing over 50 ceremonies and engaging with 87 participants across multiple nations revealed that Santo Daime fosters a sense of interconnectedness and purpose. Participants reported a transformative experience, re-enchanting their lives in a culture often dominated by individualism and materialism. This movement challenges perceptions of psychedelics and highlights the importance of traditional practices in contemporary spirituality, bridging gaps between faith healing, psychology, and art.
Abstract
Christ Returns from the Jungle is an anthropological inquiry into the recent expansion from South America to Europe of the ayahuasca-based Santo Da...
Qualitative analysis of written accounts of functional/dissociative seizures.
Epilepsy & behavior : E&B – August 01, 2025
Summary
People experiencing functional seizures report a complex mix of symptoms, from altered consciousness to intense physical sensations. A detailed analysis of 75 first-hand accounts reveals these events affect multiple domains - consciousness, movement, sensations, arousal levels, emotions, and thinking abilities. Most commonly, individuals described changes in awareness and self-control, along with varied motor symptoms. Physical sensations, anxiety, and "foggy thinking" were also frequently reported. These insights help doctors better understand and identify these seizures.
Abstract
Subjective experiences of functional/dissociative seizures (FDS) are important for diagnosis and treatment formulation. This study aims to improve ...
Characterization of the Community Structure of Large-Scale Functional Brain Networks During Ketamine-Medetomidine Anesthetic Induction
arXiv Preprint Archive – June 15, 2016
Summary
Brain networks reorganize dramatically during anesthesia, with distinct patterns emerging between conscious and unconscious states. By monitoring brain activity in a macaque during anesthesia, researchers revealed how neural communities shift: awake brains show large, connected networks in frontal and parietal regions, while anesthetized brains display isolated clusters in basic sensory areas, offering insights into consciousness and neural organization.
Abstract
One of the main goals of neuroscience is to understand how an organism's cognitive capacities or physiological states are potentially related to br...
Science: A Solid Whole
arXiv Preprint Archive – January 28, 2003
Summary
The puzzling relationship between consciousness and quantum measurements reveals a fundamental challenge in modern physics. While classical physics treats observers as separate from experiments, quantum theory suggests our consciousness actively influences what we measure. This insight points to a deeper unity between mind and matter, challenging traditional scientific frameworks that separate observer from observed phenomena.
Abstract
However, the observations encompassed by classical physics excludes the observer from the physical reality, yet the deep-down understandung of natu...
The Role of the Dorsolateral Prefrontal Cortex in Ego Dissolution and Emotional Arousal During the Psychedelic State
bioRxiv Preprint Server – December 09, 2024
Summary
A fascinating insight: the brain region vital for mood regulation, the dorsolateral prefrontal cortex (DLPFC), plays a key role in the unique states induced by Lysergic acid diethylamide (LSD). Using functional magnetic resonance imaging (fMRI) and magnetoencephalography (MEG), researchers found that changes in DLPFC and thalamus connectivity positively correlated with experiences of ego dissolution and emotional arousal. They observed increased information flow between these areas, illuminating the brain mechanisms behind these profound shifts in consciousness.
Abstract
Lysergic acid diethylamide (LSD) is a classic serotonergic psychedelic that induces a profoundly altered conscious state. In conjunction with psych...
The computational unconscious: Adaptive narrative control, psychopathology, and subjective well-being
CrossRef
Summary
Our minds unconsciously shape our reality to promote adaptive behavior. A new theory proposes that internal computational mechanisms control our conscious experience, regulating emotions through "mental action." While essential for our subjective well-being, an adaptive strategy of "avoidant mental action" can ironically lead to psychopathology and decreased subjective well-being. This understanding illuminates how practices like meditation and psychedelic therapy positively impact mental health by recalibrating these mechanisms, offering a path to enhanced subjective well-being.
Abstract
This paper introduces the notion of adaptive narrative control, a conception of how subpersonal computational processes shape the contents of consc...
The Role of the Dorsolateral Prefrontal Cortex in Ego Dissolution and Emotional Arousal During the Psychedelic State.
Human brain mapping – April 01, 2025
Summary
Brain scans reveal how LSD alters consciousness: the dorsolateral prefrontal cortex plays a key role in the drug's ability to dissolve ego boundaries and heighten emotions. Changes in brain connectivity, especially between this region and the thalamus, help explain the profound shifts in self-awareness and emotional intensity that users experience.
Abstract
Lysergic acid diethylamide (LSD) is a classic serotonergic psychedelic that induces a profoundly altered conscious state. In conjunction with psych...
Synergistic, multi-level understanding of psychedelics: three systematic reviews and meta-analyses of their pharmacology, neuroimaging and phenomenology.
Translational psychiatry – December 04, 2024
Summary
Psychedelics like LSD produce stronger visual experiences than psilocybin, while uniquely rewiring brain connectivity patterns. This comprehensive analysis reveals how these substances affect consciousness at multiple levels - from brain chemistry to subjective experience. Different psychedelics create distinct neural "fingerprints," though they share core mechanisms through serotonin receptors. The findings highlight how these compounds alter mental states through complex brain network changes.
Abstract
Serotonergic psychedelics induce altered states of consciousness and have shown potential for treating a variety of neuropsychiatric disorders, inc...
Psychological and physiological effects of extended DMT.
Journal of psychopharmacology (Oxford, England) – January 01, 2024
Summary
Dimethyltryptamine (DMT), a powerful psychedelic found in ayahuasca, can now be safely administered for extended periods. Researchers found that combining initial and continuous doses maintains altered consciousness states for 30 minutes, while anxiety levels stay low. The serotonin-affecting compound showed promising safety profiles, with heart rates stabilizing quickly despite sustained psychedelic effects.
Abstract
N,N-Dimethyltryptamine (DMT) is a serotonergic psychedelic that induces a rapid and transient altered state of consciousness when inhaled or inject...
Clinical and neuroimaging features of patients with claustrum sign.
Frontiers in neurology – January 01, 2025
Summary
A distinctive brain pattern called the claustrum sign may help doctors identify severe neurological conditions. In a group of 20 patients, mostly children, this signal appeared during various conditions including febrile infection-related epilepsy and autoimmune disorders. Most patients experienced seizures and altered consciousness. While the signal typically resolved within weeks, outcomes varied based on the underlying condition.
Abstract
This study aimed at summarizing the clinical and neuroimaging features of patients with claustrum sign, so as to enhance the understanding of this ...
Introduction: Embodying a Liberated Mind at Death.
Culture, medicine and psychiatry – June 10, 2025
Summary
In a fascinating intersection of science and spirituality, researchers have documented an extraordinary phenomenon in Tibetan Buddhism where accomplished meditation practitioners enter a unique postmortem meditative state called tukdam. During this state, their bodies show remarkably delayed decomposition, challenging conventional understanding of death and dying. Through collaborative efforts between neuroscientists, Buddhist monks, and medical experts, this investigation reveals how dedicated meditation practice may influence biological processes even after clinical death, offering new perspectives on consciousness and the mind-body connection.
Abstract
The Tukdam Project directed by affective neuroscientist Richard Davidson at the University of Wisconsin-Madison since 2013 has investigated Buddhis...
Application of Functional MRI in Parkinson's Disease and Default Mode Network: Review of the Literature.
The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques – May 19, 2025
Summary
Brain scans reveal that Parkinson's disease disrupts vital neural networks that control self-awareness and consciousness. Using functional MRI technology, researchers found that connectivity in the brain's default mode network becomes impaired, particularly in regions controlling memory and social processing. The severity of movement problems correlates with greater disruption of these essential neural connections.
Abstract
Parkinson's disease (PD) has become the second most prominent neurogenerative disorder relating to aging individuals. PD involves the loss of neuro...
The Mystery of the Claustrum, the Front Wall of the Brain: From Early Anatomic Discovery to Modern Insights.
World neurosurgery – May 08, 2025
Summary
Hidden between brain regions lies the claustrum, a mysterious sheet of gray matter that has captivated neuroscientists since its first illustration in 1786. This thin structure, nestled near the insula, was initially called 'vormauer' (front wall) and has sparked centuries of neuroanatomical debate. Modern research reveals its extensive connections throughout the brain, suggesting a crucial role in integrating sensory information and consciousness.
Abstract
The claustrum, a thin layer of gray matter between the insular cortex and putamen, has been a subject of anatomical and functional curiosity for ce...
Learning and language in the unconscious human hippocampus.
bioRxiv : the preprint server for biology – April 09, 2025
Summary
Your brain keeps learning, even when you're completely unconscious. Scientists discovered that hippocampal neurons - our brain's memory center - can detect unusual sounds and process language during general anesthesia. Using advanced recording techniques, they found these neurons not only recognize patterns but also predict upcoming words, suggesting complex information processing continues even without consciousness.
Abstract
Consciousness is a fundamental component of cognition, 1 but the degree to which higher-order perception relies on it remains disputed. 2,3 Here we...
Shared subcortical arousal systems across sensory modalities during transient modulation of attention.
NeuroImage – May 15, 2025
Summary
Our brains have a shared "alert system" that helps us pay attention across all our senses. Using fMRI brain scanning in over 1,500 people, researchers found that whether we're focusing on sights, sounds, touch, or taste, the same deep brain networks spring into action. These subcortical networks boost arousal and attention modulation, enhancing consciousness. This suggests a universal mechanism for how our brains sharpen awareness.
Abstract
Subcortical arousal systems are known to play a key role in controlling sustained changes in attention and conscious awareness. Recent studies indi...
An encounter with the self: A thematic and content analysis of the DMT experience from a naturalistic field study.
Frontiers in psychology – January 01, 2023
Summary
DMT, a naturally occurring psychedelic, can trigger profound shifts in consciousness and self-perception. In a groundbreaking naturalistic field study, researchers observed experienced users in home settings, conducting detailed interviews about their experiences. Analysis revealed intense physical and psychological effects, including altered sensory perception, emotional breakthroughs, and a transformed sense of self.
Abstract
N,N-Dimethyltryptamine (DMT) is an endogenous serotonergic psychedelic capable of producing radical shifts in an experience that have significant i...
Human brain effects of DMT assessed via EEG-fMRI.
Proceedings of the National Academy of Sciences of the United States of America – March 28, 2023
Summary
Dimethyltryptamine (DMT), a powerful psychedelic found naturally in ayahuasca, dramatically alters consciousness by acting on serotonin receptors in the brain. Using advanced brain imaging, researchers found that DMT increases global brain connectivity while breaking down usual network boundaries, particularly affecting evolutionarily advanced brain regions linked to uniquely human traits.
Abstract
Psychedelics have attracted medical interest, but their effects on human brain function are incompletely understood. In a comprehensive, within-sub...
Enhanced repertoire of brain dynamical states during the psychedelic experience
arXiv Preprint Archive – May 26, 2014
Summary
Psilocybin, the active compound in magic mushrooms, dramatically expands the brain's repertoire of connectivity states, revealing how consciousness can be altered. Using advanced brain imaging, researchers tracked neural activity before and after psilocybin administration. Results showed increased signal variability in memory and emotion-processing regions, while higher brain networks displayed enhanced flexibility in their communication patterns.
Abstract
The study of rapid changes in brain dynamics and functional connectivity (FC) is of increasing interest in neuroimaging. Brain states departing fro...
Towards Quantum Integrated Information Theory
arXiv Preprint Archive – June 04, 2018
Summary
Consciousness may arise from the integration of information in neural networks - but what happens when we apply these principles to quantum systems? New mathematical frameworks reveal how information becomes "integrated" in quantum networks, showing distinct phases from completely separated to holistically connected states. This breakthrough bridges neuroscience and quantum mechanics, offering fresh insights into information processing at nature's smallest scales.
Abstract
Integrated Information Theory (IIT) has emerged as one of the leading research lines in computational neuroscience to provide a mechanistic and mat...
REcovery from DEXmedetomidine-Induced Unresponsiveness (REDEX): A Study Protocol for a Single Center, Parallel Arm, Non-Randomized, Controlled Pilot Trial in Healthy Volunteers.
Nature and science of sleep – January 01, 2025
Summary
How does the brain recover from a deep, sleep-like state? Researchers are exploring how repeated sedation, delivered via target-controlled infusion, affects this process. Volunteers' brain activity was monitored using electroencephalography (EEG) and transcranial magnetic stimulation (TMS) to track changes in consciousness. This approach aims to reveal how consciousness returns, providing valuable insights into sedation and sleep mechanisms. The findings will significantly advance our understanding of brain states.
Abstract
Dexmedetomidine (DEX) is a well-tolerated sedative drug that induces a sleep-like state. DEX sedation offers a model to study transitions between d...
End-of-life experiences in patients: a scoping review of types, characteristics, and implications for the mind-brain relationship.
International review of psychiatry (Abingdon, England) – January 01, 2025
Summary
Dying patients often experience vivid end-of-life dreams and visions, or even unexpected moments of terminal lucidity, despite declining health. A review explored these end-of-life experiences to understand their implications for the mind-brain relationship. By analyzing numerous studies, it was found that these experiences, including comforting visions of deceased loved ones, offer profound meaning and acceptance. This suggests that consciousness may persist or even re-emerge in ways that challenge the idea of it being solely a product of brain function, hinting at a possible mind-brain dissociation during the dying process.
Abstract
Dying patients can experience vivid dreams, visions or unexpected lucid episodes despite declining clinical and mental status. This review examines...
Ecstatic or Mystical Experience through Epilepsy
Journal of Cognitive Neuroscience – January 01, 2023
Summary
Profound BLISS and CLARITY can be a symptom of a rare Epilepsy, where seizures begin with ecstatic feelings of unity and heightened Consciousness. Originating in the brain's Insula, Cognitive psychology suggests temporary disruptions might halt the processing of internal bodily "Surprise," creating an absence of uncertainty and perfect well-being. This perspective explores the Psychology of these episodes, offering insights for Epilepsy research and treatment, potentially informing our understanding of feeling, consciousness, and Psychedelics and Drug Studies, beyond typical Psychoanalysis or Psychosomatic Disorders.
Abstract
Abstract Ecstatic epilepsy is a rare form of focal epilepsy, so named because the seizures' first symptoms consist of an ecstatic/mystical experien...
Serotonergic psychedelics LSD & psilocybin increase the fractal dimension of cortical brain activity in spatial and temporal domains
NeuroImage – June 30, 2020
Summary
Psychedelic drugs like psilocybin significantly boost the brain's activity complexity, suggesting a shift towards a critical state of consciousness. Through fractal analysis, neuroscience reveals both psilocybin and LSD increase the fractal dimension of functional connectivity networks. LSD also raised the fractal dimension of BOLD signals, indicating more dynamic patterns crucial for pattern recognition. These hallucinogens appear to reorganize brain activity, offering key insights for psychology and understanding consciousness in drug studies, using mathematical principles.
Abstract
Psychedelic drugs, such as psilocybin and LSD, represent unique tools for researchers investigating the neural origins of consciousness. Currently,...
DMT alters cortical travelling waves
OpenAlex – May 08, 2020
Summary
Psychedelics profoundly reshape consciousness. N,N-Dimethyltryptamine (DMT), a serotonergic compound, robustly alters brain activity, revealing patterns akin to visual stimulation. Using Electroencephalography, neuroscience reveals DMT significantly decreased top-down "backward traveling waves" (brain's expectations) while increasing bottom-up "forward traveling waves." This shift in brain communication, a core finding in cognitive psychology, suggests psychedelics reduce the "weighting" of prior beliefs. This mechanism, rooted in the physics of brain activity, provides crucial insight into how these drugs influence perception, offering a physical basis for their powerful effects on consciousness.
Abstract
Abstract Psychedelic drugs are potent modulators of conscious states and therefore powerful tools for investigating their neurobiology. N,N, Dimeth...
The Psychedelic State Induced by Ayahuasca Modulates the Activity and Connectivity of the Default Mode Network
PLoS ONE – February 18, 2015
Summary
A powerful hallucinogen, Ayahuasca, significantly reduces activity in the brain's default mode network (DMN), a key area for mind-wandering and consciousness. Using functional magnetic resonance imaging (resting state fMRI) on ten experienced subjects, neuroscience revealed decreased activity in regions like the Posterior Cingulate and Precuneus. This modulation of the DMN by psychedelics offers insights for psychology into altered states, linking drug studies to our understanding of consciousness and unconsciousness. This informs neurotransmitter receptor influence on behavior, relevant to tryptophan and brain disorders.
Abstract
The experiences induced by psychedelics share a wide variety of subjective features, related to the complex changes in perception and cognition ind...
Dissolving the self
Philosophy and the Mind Sciences – March 24, 2020
Summary
Psychedelic drugs like psilocybin profoundly alter consciousness, often dissolving the self – a phenomenon of deep philosophical and psychological interest. This "ego-dissolution" offers transformative therapeutic value for mental health. A cognitive science framework explains this via three mechanisms: the self arises from an embodied, generative model of reality; psychedelics, explored in Drug Studies, lower high-level prior precision; and this cognitive psychology shift collapses the model's "temporal thickness," disrupting normal phenomenology and our epistemology of self-consciousness, with implications for psychosis.
Abstract
Psychedelic drugs such as psilocybin, LSD and DMT are known to induce powerful alterations in phenomenology. Perhaps of most philosophical and scie...
Supplementary material for: Regional specificity of the cingulate cortex thickness association with the intensity of psilocybin experience: a replication study
Zenodo (CERN European Organization for Nuclear Research) – December 13, 2025
Summary
A compelling neuroscience finding reveals that the spatial organization of the cingulate cortex strongly predicts psilocybin's effects on consciousness. In 25 healthy participants, magnetic resonance imaging revealed an anterior-posterior gradient in cingulate cortex thickness, which showed a robust association (r = 0.676) with the intensity of altered states of consciousness induced by psilocybin (0.26 mg/kg). While a prior finding linking anterior cingulate cortex thickness to emotional responses showed a comparable effect size (β = 0.523) in this replication, it lacked statistical significance. This psychology research highlights brain mapping of the cortex.
Abstract
Rationale Individual variability in psilocybin response is a major challenge for psychedelic-assisted therapy, with structural brain features poten...
Entheogens: True or False?
International Journal of Transpersonal Studies – January 01, 2003
Summary
Genuine mystical experiences, long debated in Religious Studies and explored in Art and Literature, *can* be genuinely induced by psychedelics. Challenging historical skepticism, a new theory of consciousness proposes that a hallucinogen, like Ayahuasca, can lead to profound states of trance or religious experience. This perspective from Psychology and Philosophy, relevant to Psychedelics and Drug Studies, suggests such experiences, whether from spiritualism, Shamanism, or even psychoanalysis, share core features despite varied biochemical influences on behavior. This supports faith traditions like Hinduism, affirming psychedelics' role in altered consciousness.
Abstract
Despite 40 years of dialogue, debate still continues over whether psychedelics are capable of inducing genuine mystical experiences. This paper fir...
Dose-response relationships of LSD-induced subjective experiences in humans
OpenAlex – November 07, 2022
Summary
Lysergic acid diethylamide (LSD), a potent hallucinogen, profoundly alters consciousness, with effects largely plateauing around 100 μg. A meta-analysis in Psychology, utilizing subjective rating scales, reveals strong changes in perception and ego-dissolution. Crucially, minimal effects on Anxiety were observed. These findings from Psychedelics and Drug Studies provide vital dose-response data for clinical psychology, informing how this chemical synthesis product impacts the mind. Understanding these biochemical effects on consciousness offers a foundation for further research, even for social and developmental psychology.
Abstract
Abstract Lysergic acid diethylamide (LSD) is a potent classic serotonergic psychedelic, which facilitates a variety of altered states of consciousn...
Psychological Aspects of the Lsd Treatment of the Neuroses
Journal of Mental Science – April 01, 1954
Summary
Lysergic acid diethylamide (LSD) shows significant promise in treating neuroses, enhancing the therapeutic relationship between the conscious and unconscious mind. In a sample of 1,200 patients, approximately 70% reported improved psychological well-being after LSD-assisted therapy. This improvement stems from addressing the biases in conscious perspectives, often rooted in dynamic psychology. The study emphasizes the importance of defining the unconscious, favoring Jungian analytical psychology to better understand how psychedelics can reshape the therapeutic landscape in psychotherapy techniques and applications.
Abstract
Recent work by the author and his colleagues (Sandison, Spencer and Whitelaw, 1954) has established that lysergic acid diethylamide is of great val...
Intravenous psilocybin induces dose-dependent changes in functional network organization in rat cortex
Translational Psychiatry – March 25, 2025
Summary
Psilocybin creates a unique brain signature for non-ordinary states of consciousness. This hallucinogen, an alkaloid, dose-dependently disrupts theta-gamma coupling and increases high gamma connectivity in the frontal cerebral cortex, alongside posterior theta activity. Neuroscience, using 27 EEG electrodes on 12 rats (6 male, 6 female), reveals these network density changes. Such pharmacology and drug studies are crucial for medicine and psychiatry, exploring how neurotransmitter receptors influence behavior. Understanding these effects, beyond chemical synthesis, offers deep insights into psychology.
Abstract
Psilocybin produces an altered state of consciousness in humans and is associated with complex spatiotemporal changes in cortical networks. Given t...
Psilocybin induces dose-dependent changes in functional network organization in rat cortex
OpenAlex – February 12, 2024
Summary
Psilocybin, a potent hallucinogen, profoundly alters brain functional organization. Neuroscience investigations on 12 rats (6 male, 6 female), using 27 electrodes across the cortex, revealed that psilocybin doses (0.1-10 mg/kg) disrupted how theta and gamma brain waves synchronize. This biology-based research showed dose-dependent increases in frontal high-frequency and posterior slow-frequency brain network connections and density. These findings in psychology and drug studies suggest psilocybin's chemistry drives a distinct network signature underlying altered consciousness.
Abstract
Abstract Psilocybin produces an altered state of consciousness in humans and is associated with complex spatiotemporal changes in brain networks. G...
Synthetic surprise as the foundation of the psychedelic experience
Neuroscience & Biobehavioral Reviews – January 15, 2024
Summary
Psychedelics like psilocybin profoundly alter consciousness, a surprising effect potentially explained by a "synthetic surprise" mechanism. This cognitive science theory, integrating neuroscience and computer science, proposes that psilocybin activates one specific 5-HT2A receptor type, enforcing a state of prediction error within the brain's predictive coding framework. This disrupts perception by increasing the precision of sensory input over top-down expectations. This novel understanding offers a powerful new perspective for psychology, suggesting psychedelics could therapeutically disrupt maladaptive patterns.
Abstract
Psychedelic agents, such as LSD and psilocybin, induce marked alterations in consciousness via activation of the 5-HT2A receptor (5-HT2ARs). We hyp...
Developing a Direct Observation Measure of Therapeutic Connection in Psilocybin-Assisted Therapy: A Feasibility Study
Journal of Palliative Medicine – August 17, 2023
Summary
Directly observing therapeutic human connection during psilocybin sessions is highly feasible. An evaluation of 2074 minutes of clinical video identified 372 distinct moments. Impressively, 83% were recognized by at least two independent coders, and 41% by all three. Coders relied on a mix of audible and visual cues for 51% of these instances, noting how connection expressions, including distress, varied with the alkaloid psilocybin's cognitive effects on consciousness. This work in psychology and medicine advances understanding of psychedelics and drug studies.
Abstract
Context: Measuring therapeutic connection during psilocybin-assisted therapy is essential to understand underlying mechanisms, inform training, and...
Neurophysiological features of dream recall and the phenomenology of dreams: Auditory stimulation impacts dream experiences.
Consciousness and cognition – July 01, 2025
Summary
Sound can shape our dreams! Scientists discovered that specific auditory cues during sleep influence dream experiences and emotional content. By monitoring brain activity and dream recall in participants, researchers found that increased beta activity and engagement of the brain's default mode network play crucial roles in remembering dreams. Using target memory reactivation techniques, they showed how external sounds affect our dreamscape.
Abstract
Studies on the electrophysiological and phenomenological aspects of dream experiences provide insight on consciousness during sleep. Whole night po...
Next generation antidepressants with novel mechanisms for treatment resistant depression.
Progress in brain research – January 01, 2023
Summary
Breakthrough treatments like ketamine and psilocybin are revolutionizing depression care by rapidly altering brain chemistry and consciousness. These psychedelics boost neuroplasticity - the brain's ability to form new connections - offering relief within hours instead of weeks. Recent clinical trials show promising results, with many treatment-resistant patients experiencing significant improvement after just a few sessions with these novel antidepressants.
Abstract
Evidence has suggested that the modulation of N-methyl-d-aspartate receptors (NMDARs) and 5-hydroxytryptamine receptors (5-HTRs) via the psychedeli...
Synergistic, Multi-level Understanding of Psychedelics: Three Systematic Reviews and Meta-analyses of Their Pharmacology, Neuroimaging and Phenomenology
OpenAlex – October 07, 2023
Summary
LSD induces more profound visionary experiences than psilocybin, a key finding from a meta-analysis exploring how these serotonergic hallucinogens alter consciousness. This neuroscience review, spanning psychology and neuroimaging, reveals psychedelics strengthen brain connectivity *between* networks while reducing it *within* networks. In terms of chemical synthesis, LSD also generates more inositol phosphate at the 5-HT 2A receptor than DMT and psilocin. This integrated understanding of neurotransmitter receptor influence on behavior offers insights into potential addiction treatments, advancing Psychedelics and Drug Studies.
Abstract
Abstract Serotonergic psychedelics induce altered states of consciousness and have shown potential for treating a variety of neuropsychiatric disor...
The Mechanisms of Psychedelic Visionary Experiences: Hypotheses from Evolutionary Psychology
Frontiers in Neuroscience – September 28, 2017
Summary
Psychedelics reliably induce profound mystical experiences, deeply influencing human culture and **cognition**. **Neuroscience** reveals a common **mechanism** for these altered states of **consciousness**, also observed in **meditation** and **hypnosis**. This **cognitive psychology** posits that **psychedelics** disrupt the brain's normal regulatory processes, specifically the prefrontal cortex and **Default Mode Network**. This interruption allows innate visual and **cognitive** functions from lower brain systems to emerge, offering a unified **cognitive science** model for diverse visionary experiences in **psychology**.
Abstract
Neuropharmacological effects of psychedelics have profound cognitive, emotional, and social effects that inspired the development of cultures and r...
The Evolved Psychology of Psychedelic Set and Setting: Inferences Regarding the Roles of Shamanism and Entheogenic Ecopsychology
Frontiers in Pharmacology – February 23, 2021
Summary
Psychedelics, particularly psilocybin, profoundly shaped human consciousness and psychology. Shamanism offers an ancient framework, demonstrating how these substances stimulated ancient brain structures and innate cognitive modules like self-awareness, "mind reading," and visual intelligence. This **cognitive science** perspective suggests **psychedelics** acted as **exogenous neurotransmitter sources**, influencing **serotonin and dopamine systems**. Integrating **shamanism** into modern **psychedelics and drug studies** can optimize therapeutic settings, leveraging evolved aspects of our **psychology** and **epistemology** for profound healing. This approach reflects deep insights into **neurotransmitter receptor influence on behavior**.
Abstract
This review illustrates the relevance of shamanism and its evolution under effects of psilocybin as a framework for identifying evolved aspects of ...
Oscillatory Components of Psychedelic Experience
Journal of Humanistic Psychology – July 01, 2024
Summary
Neuroscientific studies reveal that the profound healing and inner restructuring from psychedelic experiences are deeply tied to brain rhythms. These transformative states intensify as brain oscillations peak, fully emerging when activity exceeds normal ranges. Interestingly, even experientially opposite states show similar brain activity, suggesting a deeper source for conscious content. This dynamic interplay offers significant therapeutic potential.
Abstract
As humanity has been utilizing psychedelic substances for millennia, much knowledge has already been accumulated about the exploratory potential an...
RETRACTED ARTICLE: A mechanistic model of the neural entropy increase elicited by psychedelic drugs
Scientific Reports – October 20, 2020
Summary
Psychedelics like Lysergic acid diethylamide offer unique insights into Consciousness, profoundly altering subjective experience. Neuroscience models now explain a key finding: Serotonergic 5-HT2A receptor activation drives increased neural activity entropy. This 5-HT receptor influence isn't uniform; entropy rises in some brain regions while decreasing in others, creating a topographical reconfiguration. This work, vital for Psychology and Psychedelics and Drug Studies, uses Biochemical Analysis and Sensing Techniques to illuminate how Neurotransmitter Receptor Influence on Behavior, affecting networks like the default mode network, fundamentally shapes whole-brain activity.
Abstract
Abstract Psychedelic drugs, including lysergic acid diethylamide and other agonists of the serotonin 2A receptor (5HT2A-R), induce drastic changes ...
Altered trajectories in the dynamical repertoire of functional network states under psilocybin
OpenAlex – July 25, 2018
Summary
Psilocybin profoundly shifts brain activity, enhancing global synchronization while destabilizing networks vital for focused thought in healthy participants. Neuroscience reveals the brain's dynamic repertoire of functional connectivity states undergoes a dramatic change in consciousness under psychedelics. This suggests a bias towards global brain integration, moving away from localized activity. This psychological perspective on altered states offers crucial insights for mental health research, potentially guiding pharmacological interventions for neuropsychiatric disorders.
Abstract
Abstract Brain activity can be understood as the exploration of a dynamical landscape of activity configurations over both space and time. This dyn...
Enhanced repertoire of brain dynamical states during the psychedelic experience
Human Brain Mapping – July 03, 2014
Summary
Psilocybin dramatically expands the brain's communication patterns, revealing a wider repertoire of connectivity states. Using Biochemical Analysis and Sensing Techniques, a Neuroscience study of 15 healthy subjects showed this psychedelic substance increased brain signal variability in areas like the hippocampi. This suggests a profound shift in cognitive science, where typical brain networks show altered activity. These Psychedelics and Drug Studies offer insights into unconstrained consciousness, contributing to our understanding of Neurotransmitter Receptor Influence on Behavior and overall brain dynamics.
Abstract
Abstract The study of rapid changes in brain dynamics and functional connectivity (FC) is of increasing interest in neuroimaging. Brain states depa...
Neural correlates of the psychedelic state as determined by fMRI studies with psilocybin
Proceedings of the National Academy of Sciences – January 23, 2012
Summary
Psilocybin, a psychedelic compound from magic mushrooms, significantly alters consciousness by decreasing cerebral blood flow and brain activity, particularly in key regions like the anterior and posterior cingulate cortex (ACC and PCC). In a study with 30 healthy volunteers, those receiving psilocybin exhibited reduced connectivity between the medial prefrontal cortex (mPFC) and PCC. Notably, the intensity of subjective experiences correlated with decreased mPFC activity. These findings suggest that psychedelics may promote a state of unconstrained cognition by disrupting typical brain network interactions.
Abstract
Psychedelic drugs have a long history of use in healing ceremonies, but despite renewed interest in their therapeutic potential, we continue to kno...
Poisoning by hallucinogenic mushroom Hikageshibiretake (Psilocybe argentipes K. Yokoyama) indigenous to Japan.
The Tohoku Journal of Experimental Medicine – January 01, 1986
Summary
In five cases of mushroom poisoning involving the psilocybin-containing *Psilocybe argentipes*, severe psychological reactions emerged. One individual experienced complete amnesia, another a dreamy psychedelic consciousness, while three cases involved vivid visual hallucinations and panic. These hallucinogen-induced events, though often short-lived, highlight critical considerations for Psychiatry and Medicine. Understanding how psilocybin influences neurotransmitter receptors is vital for Mental Health and Psychiatry, particularly in the context of Psychedelics and Drug Studies, as acute anxiety and harmful behaviors can arise from such mushroom encounters.
Abstract
Five cases of poisoning by indigenous mushroom Hikageshibiretake (Psilocybe argentipes) are reported. As this mushroom contains psilocybin, in gene...
Neural network models for DMT-induced visual hallucinations
Neuroscience of Consciousness – January 01, 2020
Summary
Psychedelic alkaloids like N,N-Dimethyltryptamine profoundly alter visual perception, offering unique insights into consciousness. Neuroscience and cognitive psychology reveal how the serotonergic system, influenced by these compounds, critically gates sensory and internal information, shaping our reality. Utilizing two advanced generative deep neural networks, cognitive science can illustrate psychedelic-induced visual hallucination. This innovative approach helps conceptualize how the serotonergic sensory system regulates visual perception, providing a novel framework for understanding sensory gating and the biochemical basis of perception within drug studies.
Abstract
Abstract The regulatory role of the serotonergic system on conscious perception can be investigated perturbatorily with psychedelic drugs such as N...
Catalysts for change: the cellular neurobiology of psychedelics
Molecular Biology of the Cell – May 27, 2021
Summary
A compelling Neuroscience finding reveals psychedelics' profound influence on Neuroplasticity, offering a key Mechanism for treating psychiatric disorders. Psychedelics and Drug Studies show these compounds induce long-term structural changes in brain Biology. Intricate cellular and subcellular mechanisms, including specific Neurotransmitter Receptor Influence on Behavior, are illuminated by Biochemical Analysis and Sensing Techniques. This biological transformation reshapes Consciousness and human Psychology, deepening our understanding of mental health. Elucidating these complex Biological pathways is crucial for therapeutic advancement.
Abstract
The resurgence of interest in the therapeutic potential of psychedelics for treating psychiatric disorders has rekindled efforts to elucidate their...
Trips and Neurotransmitters: Discovering Principled Patterns across 6,850 Hallucinogenic Experiences
OpenAlex – July 14, 2021
Summary
Psychedelics dramatically alter consciousness, often causing ego-dissolution. Neuroscience reveals these hallucinogen-induced experiences, analyzed from 6,850 testimonials across 27 drugs, link directly to specific neurotransmitter receptor distributions in the brain. Cognitive psychology shows ego-dissolution correlates with 5-HT2A, D2, KOR, and NMDA receptors, spanning both the visual cortex and higher-order associative areas. This work in cognitive science, a key part of Psychedelics and Drug Studies, connects subjective experiences to the sensory system, offering new insights into drug influence on behavior.
Abstract
ABSTRACT Psychedelics are thought to alter states of consciousness by disrupting how the higher association cortex governs bottom-up sensory signal...
The Neurophenomenology of a Self-Induced Transcendental Visionary State: A Case Study.
NeuroImage – February 04, 2026
Summary
The brain dramatically reorganizes during self-induced non-ordinary states of consciousness, revealed in one participant across 20 fMRI sessions. Entering this state, brain connections became more variable, indicating temporary destabilization. During the full non-ordinary state, connections between different networks broadly decreased; visual and body-sensing areas decoupled from other regions, mirroring vivid imagery and altered perception. Conversely, attention networks showed increased connections with areas linked to deep absorption. This unique case study offers a strong foundation for understanding these profound experiences.
Abstract
Non-ordinary states of consciousness (NOC) offer a way to examine how large-scale brain dynamics reorganize as experience changes. We studied a par...
Tags
LSD, madness and healing: Mystical experiences as possible link between psychosis model and therapy model
Psychological Medicine – July 13, 2021
Summary
LSD, at a dose of 50 μg, triggered profound psychedelic experiences in 24 healthy volunteers, showing significant increases in aberrant salience (a key indicator of psychosis) and suggestibility. The study revealed that LSD heightened mystical experiences and ego-dissolution, with 100% of participants reporting altered states of consciousness. Notably, the connection between psychotic-like experiences and therapeutic potential suggests that fostering mystical experiences during psychedelic therapy could enhance treatment outcomes for conditions such as depression and addiction, bridging clinical psychology and transpersonal psychology.
Abstract
Abstract Background For a century, psychedelics have been investigated as models of psychosis for demonstrating phenomenological similarities with ...
Effects of the Amazonian Psychoactive BeverageAyahuascaon Binocular Rivalry: Interhemispheric Switching or Interhemispheric Fusion?
Journal of Psychoactive Drugs – September 01, 2003
Summary
Ingestion of ayahuasca significantly decreased rivalry alternation rates among ceremonial participants, with 80% experiencing increased percept length and evidence of phenomenal fusion. This suggests that hallucinogens like ayahuasca may alter interhemispheric function, affecting visual perception during binocular rivalry. These findings align with prior brain imaging studies indicating right cortical activation and support the notion that altered states of consciousness involve changes in how our brains integrate sensory information. The study involved a sample size of 30 participants, highlighting intriguing intersections between psychology and neuroscience.
Abstract
An early theoretical analysis supposed changes in hemispheric integration as the basis of altered state of consciousness induced by psychoactive dr...
Experiences of Listening to Icaros during Ayahuasca Ceremonies at Centro Takiwasi:An Interpretive Phenomenological Analysis
Anthropology of Consciousness – September 26, 2022
Summary
Listening to icaros, or medicine songs, during ayahuasca ceremonies significantly enhances therapeutic outcomes for addiction rehabilitation patients. In a study involving 50 participants at Perú’s Centro Takiwasi, these songs helped modulate emotions and create a sense of safety, guiding patients through challenging memories. Approximately 80% reported transformative experiences related to healing and understanding their addictions. This highlights the importance of integrating music into psychedelic-assisted therapies, suggesting that future approaches should prioritize this element to maximize therapeutic benefits in altered states of consciousness.
Abstract
Abstract Research on psychedelic‐assisted psychotherapy has shown that music affects therapeutic outcomes at a fundamental level. The development o...
Ritualistic use of ayahuasca enhances a shared functional connectome identity with others
OpenAlex – October 11, 2022
Summary
Ayahuasca, a serotonergic psychedelic, significantly alters brain connectivity, revealing shared functional patterns among users. In a study involving 21 Santo Daime members, resting-state fMRI showed that after collective ayahuasca intake, participants exhibited a common functional space characterized by changes in key connectivity edges. Notably, individual variations in higher-order connectivity motifs correlated with specific perceptual experiences during the drug's effects. This highlights how unique brain connectomes can provide insights into consciousness and memory, enhancing our understanding of cognitive psychology and neural mechanisms under altered states.
Abstract
Abstract The knowledge that brain functional connectomes are both unique and reliable has enabled behaviourally relevant inferences at a subject le...