Cited by 236Psychedelics and Drug StudiesNeurotransmitter Receptor Influence on BehaviorHallucinations in medical conditions

Modern clinical research on LSD

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Liechti, Matthias E·2017·Neuropsychopharmacology

Abstract

All modern clinical studies using the classic hallucinogen lysergic acid diethylamide (LSD) in healthy subjects or patients in the last 25 years are reviewed herein. There were five recent studies in healthy participants and one in patients. In a controlled setting, LSD acutely induced bliss, audiovisual synesthesia, altered meaning of perceptions, derealization, depersonalization, and mystical experiences. These subjective effects of LSD were mediated by the 5-HT 2A receptor. LSD increased feelings of closeness to others, openness, trust, and suggestibility. LSD impaired the recognition of sad and fearful faces, reduced left amygdala reactivity to fearful faces, and enhanced emotional empathy. LSD increased the emotional response to music and the meaning of music. LSD acutely produced deficits in sensorimotor gating, similar to observations in schizophrenia. LSD had weak autonomic stimulant effects and elevated plasma cortisol, prolactin, and oxytocin levels. Resting-state functional magnetic resonance studies showed that LSD acutely reduced the integrity of functional brain networks and increased connectivity between networks that normally are more dissociated. LSD increased functional thalamocortical connectivity and functional connectivity of the primary visual cortex with other brain areas. The latter effect was correlated with subjective hallucinations. LSD acutely induced global increases in brain entropy that were associated with greater trait openness 14 days later. In patients with anxiety associated with life-threatening disease, anxiety was reduced for 2 months after two doses of LSD. In medical settings, no complications of LSD administration were observed. These data should contribute to further investigations of the therapeutic potential of LSD in psychiatry.

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Crossref · 10.1038/npp.2017.86

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  • Both LSD and psilocybin are agonists at 5-HT1A, 5-HT2A and 5-HT2C receptors with varying affinities, whereby full or partial agonism at the 5-HT2A receptor is likely to be the necessary site of action for eliciting an altered state of consciousness including prosocial and pro-cognitive effects.

    “Both drugs are agonists at 5-HT 1A , 5-HT 2A and 5-HT 2C receptors with varying affinities, whereby the full or partial agonism at the 5-HT 2A receptor is likely to be the necessary site of action for eliciting an altered state consciousness including prosocial and pro-cognitive effects.”
  • 5-HT2A receptor signalling has also been implicated in processes of neuroplasticity, such as neurogenesis, neurodevelopment, learning, including extinction learning, cognitive flexibility and enhanced environmental sensitivity.

    “Importantly, 5-HT 2A receptor signalling has also been implicated in processes of neuroplasticity, such as neurogenesis, neurodevelopment, learning, including extinction learning, cognitive flexibility and enhanced environmental sensitivity (Liechti, 2017).”
  • Classic serotonergic psychedelics LSD and psilocybin have been shown to alter the state of consciousness in a way that is thought to be helpful during psychotherapeutic interventions.

    “For example, the classic serotonergic psychedelics LSD and psilocybin (magic mushrooms) have been shown to alter the state of consciousness in a way that is thought to be helpful during psychotherapeutic interventions (Liechti, 2017).”
  • MDMA has demonstrated anxiolytic effects when administered to patients suffering from a life-threatening illness.

    “For instance, MDMA has demonstrated anxiolytic effects when administered to patients suffering from a life-threatening illness (Liechti, 2017)”

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Research works printed but not linked: 2

  1. Schmidt A, Müller F, Lenz C, Dolder PC, Schmid Y, Zanchi D et al (2017). Acute LSD effects on response inhibition neuronal networks in healthy subjects. (submitted and under review).
  2. Sheehan DV (1972). Review of the use of LSD for the patient near death. Psychiatric Forum 3: 21–23.

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Authors
Liechti, M. E.
Affiliations
University of Basel (CH)
Corresponding author
Liechti, Matthias E
Venue
Neuropsychopharmacology
Published
2017-04-27
Volume
42
Issue
11
Pages
2114-2127
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2607844825
Cited by
236
References
86
Citations by year
2026: 18 · 2025: 24 · 2024: 26 · 2023: 42 · 2022: 22 · 2021: 34 · 2020: 33 · 2019: 17 · 2018: 14 · 2017: 5
FWCI
2.90
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • edoc (University of Basel) (acceptedVersion)
  • edoc (University of Basel)
Funders
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (170249, 320030)
Topics
  • Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Hallucinations in medical conditions
Keywords
lysergic acid diethylamide, LSD, 5-HT2A receptor, synesthesia, derealization, depersonalization, mystical experience, face recognition (cognition), amygdala, affective empathy, music perception, sensorimotor gating, autonomic effects, cortisol, prolactin, oxytocin, resting-state functional connectivity, thalamocortical connections, brain entropy, anxiety, psychedelic therapy
MeSH terms
Mental Disorders, Hallucinogens, Humans, Lysergic Acid Diethylamide, History, 20th Century, History, 21st Century

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