Common neural signatures of psychedelics : Frequency-specific energy changes and repertoire expansion revealed using connectome-harmonic decomposition Selen Atasoy, Jakub Vohryzek, Gustavo Deco, Robin L. Carhart-Harris, Morten L. Kringelbach Progress in Brain Research, 2018, Volume 242,97- https://doi.org/10.1016/bs.pbr.2018.08.009 ISSN 0079-6123 © 2018 Elsevier B.V. All rights reserved. Abstract The search for the universal laws of human brain function is still on-going but progress is being made. Here we describe the novel concepts of connectome harmonics and connectomeharmonic decomposition, which can be used to characterize the brain activity associated with any mental state. We use this new frequency-specific language to describe the brain activity elicited by psilocybin and LSD [...]
Lire la suiteEffects of a Psychedelic, Tropical Tea, Ayahuasca, on the Electroencephalographic (EEG) Activity of the Human Brain during a Shamanistic Ritual Erik Hoffmann, Jan M. Keppel Hesselink, Yatra-W.M. da Silveira Barbosa MAPS Bulletin, Multidisciplinary Association for Psychedelic Studies, USA, Spring 2001, pp 25-30 Abstract Eight channels of EEG from 12 volunteers participating in a workshop in Brazil were recorded under field conditions before and after a shamanistic ritual in which the psychoactive tea, ayahuasca, was consumed. Following three doses of the tea, the subjects showed strong and statistically significant increases of both EEG alpha (8-13Hz) and theta (4-8Hz) mean amplitudes compared to baseline while beta [...]
Lire la suiteComparison of the Neurotoxic and Seizure-Inducing Effects of Synthetic and Endogenous Cannabinoids with Δ9-Tetrahydrocannabinol Chris S. Breivogel, Jacob R. Wells, Amreen Jonas, Artik H. Mistry, Morgan L. Gravley, Rajul M. Patel, Brianna E. Whithorn, and Bonnie M. Brenseke Cannabis and Cannabinoid Research, 2019, Volume X, Number X DOI: 10.1089/can.2019.0003 Abstract Introduction : Synthetic cannabinoids (SCs) are commonly found in preparations used as recreational drugs. Although severe adverse health effects are not generally associated with cannabis use, a rising number of studies document seizures and even death after SC use. In this study, a mouse model is used to investigate the hypothesis that SCs are more [...]
Lire la suite2-Linoleoylglycerol Is a Partial Agonist of the Human Cannabinoid Type 1 Receptor that Can Suppress 2-Arachidonolyglycerol and Anandamide Activity Leanne Lu, Gareth Williams, and Patrick Doherty Cannabis and Cannabinoid Research, 2019, Volume X, Number X Doi : 10.1089/can.2019.0030 Abstract Introduction : The cannabinoid type 1 (CB1) receptor and cannabinoid type 2 (CB2) receptor are widely expressed in the body and anandamide (AEA) and 2-arachidonoylglycerol (2-AG) are their best characterized endogenous ligands. The diacylglycerol lipases (diacylglycerol lipase alpha and diacyl-glycerol lipase beta) not only synthesize essentially all the 2-AG in the body but also generate other monoacylglycerols, including 2-linoleoylglycerol (2-LG). This lipid has been proposed to modulate endocannabinoid [...]
Lire la suiteReceptor-Enriched Analysis of functional connectivity by targets (REACT) : A novel, multimodal analytical approach informed by PET to study the pharmacodynamic response of the brain under MDMA Ottavia Dipasquale, Pierluigi Selvaggi, Mattia Veronese, Anthony S. Gabay, Federico Turkheimer, Mitul A. Mehta NeuroImage, 2019, 195, 252–260 https://doi.org/10.1016/j.neuroimage.2019.04.007 A B S T R A C T One of the main limitations of pharmacological fMRI is its inability to provide a molecular insight into the main effect of compounds, leaving an open question about the relationship between drug effects and haemodynamic response. The aim of this study is to investigate the acute effects of 3,4-methylene-dioxymethamphetamine (MDMA) on functional [...]
Lire la suitePsilocybin exerts distinct effects on resting state networks 1 associated with serotonin and dopamine in mice Joanes Grandjean, David Buehlmann, Michaela Buerge, Hannes Sigrist, Erich Seifritz, Franz X. Vollenweider, Christopher R. Pryce, Markus Rudin Preprint · September 2019 Doi : 10.1101/751255 Abstract Hallucinogenic agents have been proposed as potent antidepressants; this includes the serotonin (5-HT) receptor 2A agonist psilocybin. In human subjects, psilocybin alters functional connectivity (FC) within the default-mode network (DMN), a constellation of inter-connected regions that is involved in self-reference and displays altered FC in depressive disorders. In this study we investigated the effects of psilocybin on FC in the analogue of the [...]
Lire la suiteThe Role of MDMA Neurotoxicity in Anxiety Casey R. Guillot, Mitchell E. Berman and Brenton R. Abadie In : Neurotoxicity Syndromes, Chapter I ISBN: 978-1-60021-797-5 Editor: Linda R. Webster, pp. 1 - 36 © 2007 Nova Science Publishers, Inc. Abstract The drug 3,4-methylenedioxymethamphetamine (MDMA; Ecstasy) long has been considered a neurotoxin selective for serotonin (5-hydroxytryptamine; 5-HT) axons in rats and nonhuman primates. MDMA is also thought to have the potential to cause persistent serotonergic alterations in humans. Since the serotonin system is involved in the regulation of anxiety, researchers have proposed that recreational Ecstasy users may be at risk for the development of anxiety disorders and symptoms. [...]
Lire la suiteThe endocannabinoid system : an overview Natalia Battista, Monia Di Tommaso, Monica Bari and Mauro Maccarrone Frontiers in Behavioral Neuroscience, 2012|Volume 6|Article 9 | 1 doi: 10.3389/fnbeh.2012.00009 Upon the identification of anandamide (AEA) in the porcine brain, numerous studies contributed to the current state of knowledge regarding all elements that form the “endocannabinoidsystem (ECS).” How this complex system of receptors, ligands, and enzymes is integrated in helping to regulate fundamental processes at level of central nervous and peripheral systems and how its regulation and dysregulation might counteract disturbances of such functions, is now a days still under investigation. However, the most recent advances on [...]
Lire la suiteAdolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus Grace Blest‐Hopley | Aisling O'Neill | Robin Wilson | Vincent Giampietro | David Lythgoe | Alice Egerton | Sagnik Bhattacharyya Addiction Biology, 2019, e12827, 1-11. DOI: 10.1111/adb.12827 Abstract Cannabis use has been associated with adverse mental health outcomes, the neurochemical underpinnings of which are poorly understood. Although preclinical evidence suggests glutamatergic dysfunction following cannabis exposure in several brain regions including the hippocampus, evidence from human studies have been inconsistent. We investigated the effect of persistent cannabis use on the brain levels of N‐acetyl aspartate (NAA) and myo-inositol, [...]
Lire la suitePriority Considerations for Medicinal Cannabis-Related Research Marcel O. Bonn-Miller, Charles V. Pollack, Jr., David Casarett, Richard Dart, Mahmoud ElSohly, Larry Good, Manuel Guzman, Lumır Hanus, Kevin P. Hill, Marilyn A. Huestis, Eric Marsh, Susan Sisley, Nancy Skinner, Judith Spahr, Ryan Vandrey, Eugene Viscusi, Mark A. Ware, and Donald Abrams Cannabis and Cannabinoid Research, 2019, Volume 4, Number 3, 1-19. DOI: 10.1089/can.2019.0045 Keywords : medicinal cannabis; medical marijuana Introduction and Rationale The National Academy of Sciences, Engineering, and Medicine’s 2017 publication The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations for Research provided a significant contribution by synthesizing the existing evidence base [...]
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