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 […]

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 […]

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 […]

Neural correlates of the psychedelic state

Neural correlates of the psychedelic state

Neural correlates of the psychedelic state as determined by fMRI studies with psilocybin Psychedelic drugs have a long history of use in healing ceremonies, but despite renewed interest in their therapeutic potential, we continue to know very little about how they work in the brain. Here we used psilocybin, a classic psychedelic found in magic […]

LSD enhances suggestibility in healthy volunteers

LSD enhances suggestibility in healthy volunteers

LSD enhances suggestibility in healthy volunteers Lysergic acid diethylamide (LSD) has a history of use as a psychotherapeutic aid in the treatment of mood disorders and addiction, and it was also explored as an enhancer of mind control. Objectives The present study sought to test the effect of LSD on suggestibility in a modern research […]

MDMA on subjective and BOLD-fMRI responses to autobiographical memories

MDMA on subjective and BOLD-fMRI responses to autobiographical memories

The effect of acutely administered MDMA on subjective and BOLD-fMRI responses to favourite and worst autobiographical memories 3,4-methylenedioxymethamphetamine (MDMA) is a potent monoamine-releaser that is widely used as a recreational drug. Preliminary work has supported the potential of MDMA in psychotherapy for post-traumatic stress disorder (PTSD). The neurobiological mechanisms underlying its putative efficacy are, however, […]

The Entropic Brain – A theory of conscious states

The Entropic Brain – A theory of conscious states

The Entropic Brain – A theory of conscious states informed by neuroimaging research with psychedelic drugs Entropy is a dimensionless quantity that is used for measuring uncertainty about the state of a system but it can also imply physical qualities, where high entropy is synonymous with high disorder. Entropy is applied here in the context […]