Neural correlates of the LSD experience revealed by multimodal neuroimaging

Neural correlates of the LSD experience revealed by multimodal neuroimaging

Lysergic acid diethylamide (LSD) is the prototypical psychedelic drug, but its effects on the human brain have never been studied before with modern neuroimaging. Here, three complementary neuroimag-ing techniques: arterial spin labeling (ASL), blood oxygen level- dependent (BOLD) measures, and magnetoencephalography (MEG), implemented during resting state conditions, revealed marked changes in brain activity after LSD […]

Ecstasy users report different sleep to matched controls

Ecstasy users report different sleep to matched controls

Current and former ecstasy users report different sleep to matched controls: a web-based questionnaire study This study sought to test the association between ecstasy use and abnormal sleep. An anonymous web-based questionnaire containing questions on drug use and sleep was completed by 1035 individuals. From this large sample, a group of 89 ecstasy users were […]

Waves of the Unconscious: The Neurophysiology of Dreamlike  Phenomena

Waves of the Unconscious: The Neurophysiology of Dreamlike Phenomena

Waves of the Unconscious: The Neurophysiology of Dreamlike Phenomena and Its Implications for the Psychodynamic Model of the Mind This paper reviews scientific literature on four subjective states: the dream state, the dreamy state of temporal lobe epilepsy and temporal lobe stimulation, the acute psychotic state, and the psychedelic state. Evidence is cited showing that […]

Was it a vision or a waking dream?

Was it a vision or a waking dream?

Was it a vision or a waking dream? A commentary on Disrupting posterior cingulate connectivity disconnects consciousness from the external environment by Herbet, G., Lafargue, G., de Champfleur, N. M., Moritz-Gasser, S., le Bars, E., Bonnetblanc, F., et al. (2014). Neuropsychologia 56C, 239–244. doi: 10.1016/j.neuropsychologia.2014.01.020 Reminiscent of Wilder Penfield’s famous experiments, Neurologists in France have […]

How do hallucinogens  work on the brain?

How do hallucinogens work on the brain?

How do hallucinogens work on the brain? Robin Carhart-Harris, Mendel Kaelen and David Nutt consider a big question on several levels The ‘classic’ hallucinogens – such as LSD (derived from ergotamine found in ergot fungi), dimethyltryptamine (DMT, the major hallucinogenic component of ayahuasca) and psilocybin (from magic mushrooms) – possess a unique and arguably unrivalled […]

Spatial Dependencies between Large-Scale Brain Networks

Spatial Dependencies between Large-Scale Brain Networks

Spatial Dependencies between Large-Scale Brain Networks Functional neuroimaging reveals both increases (task-positive) and decreases (task-negative) in neural activation with many tasks. Many studies show a temporal relationship between task positive and task negative networks that is important for efficient cognitive functioning. Here we provide evidence for a spatial relationship between task positive and negative networks. […]

Functional Connectivity Measures After Psilocybin Inform a Novel Hypothesis  of Early Psychosis

Functional Connectivity Measures After Psilocybin Inform a Novel Hypothesis of Early Psychosis

Functional Connectivity Measures After Psilocybin Inform a Novel Hypothesis of Early Psychosis Psilocybin is a classic psychedelic and a candidate drug model of psychosis. This study measured the effects of psilocybin on resting-state network and thalamocortical functional connectivity (FC) using functional magnetic resonance imaging (fMRI). Fifteen healthy volunteers received intravenous infusions of psilocybin and placebo in […]

The effects of psilocybin and MDMA on between-network resting state functional connectivity

The effects of psilocybin and MDMA on between-network resting state functional connectivity

The effects of psilocybin and MDMA on between-network resting state functional connectivity in healthy volunteers Perturbing a system and observing the consequences is a classic scientific strategy for understanding a phenomenon. Psychedelic drugs perturb consciousness in a marked and novel way and thus are powerful tools for studying its mechanisms. In the present analysis, we […]

Cause for a re- think on drug models of psychosis and other  psychiatric disorders

Cause for a re- think on drug models of psychosis and other psychiatric disorders

Psychiatry’s next top model: cause for a re-think on drug models of psychosis and other psychiatric disorders RL Carhart-Harris, S Brugger, DJ Nutt and JM Stone Despite the widespread application of drug modelling in psychiatric research, the relative value of different models has never been formally compared in the same analysis. Here we compared the […]

The administration of psilocybin to healthy hallucinogen experienced volunteers

The administration of psilocybin to healthy hallucinogen experienced volunteers

The administration of psilocybin to healthy,hallucinogen-experienced volunteers in a mock-functional magnetic resonance imaging environment: a preliminary investigation of tolerability This study sought to assess the tolerability of intravenously administered psilocybin in healthy, hallucinogen-experienced volunteers in a mock-magnetic resonance imaging environment as a preliminary stage to a controlled investigation using functional magnetic resonance imaging to explore […]