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Psychosurgery, the surgical alteration or permanent removal of brain tissue to alleviate severe psychological conditions, stands as one of the most radical and controversial treatments in the history of mental health care. Its development and application have evolved significantly, marked by dramatic shifts in scientific understanding and ethical perspectives.
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Hallucinogens, also known as psychedelic drugs, are a class of substances known for their ability to alter perception, cognition, and emotions. Despite their profound effects on the mind, these drugs are non-addictive, setting them apart from many other abused substances. The mechanism of action of these drugs lies in their impact on the 5-HT2A receptor in the brain. Upon activation, this receptor couples to Gq-type G proteins, triggering a cascade that releases intracellular calcium. This...
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Hallucinogens are psychoactive substances that profoundly alter perceptual experiences, generating unreal visual and sensory images. Often referred to as psychedelic drugs — a term derived from the Greek words "psyche" (mind) and "delos" (revealing) — these substances include marijuana and lysergic acid diethylamide (LSD), among others. These drugs vary in intensity and effects.
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Drug Therapy01:28

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The advent of drug therapy has profoundly shaped modern mental health care, providing targeted treatments for a range of psychological disorders. Psychotherapeutic drugs, classified into antianxiety, antidepressant, and antipsychotic medications, address symptoms across anxiety disorders, mood disorders, and schizophrenia. While these medications have transformed patient outcomes, they require careful management due to their potential side effects and limitations.
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Related Experiment Video

Updated: Dec 25, 2025

HSV-Mediated Transgene Expression of Chimeric Constructs to Study Behavioral Function of GPCR Heteromers in Mice
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Psychedelic Psychiatry's Brave New World.

David Nutt1, David Erritzoe1, Robin Carhart-Harris1

  • 1Centre for Psychedelic Research, Department of Psychiatry, Imperial College London, London W12 0NN, UK.

Cell
|April 4, 2020
PubMed
Summary

Research into psychedelic drugs, like psilocybin, is showing promising results for psychiatric disorders. These 5-Hydroxytryptamine 2A (5-HT2A) receptor agonists may offer new treatments for depression and addiction.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Pharmacology

Background:

  • Decades-long global research moratorium on psychedelic drugs has lifted.
  • Psychedelic research is resurging with significant scientific interest.
  • 5-Hydroxytryptamine 2A (5-HT2A) receptor agonists are a key focus.

Purpose of the Study:

  • To investigate the therapeutic potential of psychedelics in psychiatric disorders.
  • To explore the efficacy of 5-HT2A receptor agonists in clinical settings.
  • To evaluate outcomes for conditions such as depression and addiction.

Main Methods:

  • Neuroscience research methodologies.
  • Clinical trials investigating psychedelic compounds.
  • Analysis of 5-HT2A receptor agonist effects.

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Main Results:

  • Psychedelic drug research is yielding exciting clinical outcomes.
  • 5-HT2A receptor agonists demonstrate promise as therapeutic agents.
  • Potential applications identified for depression and addiction treatment.

Conclusions:

  • The investigation of psychedelics in psychiatric disorders is highly promising.
  • Psilocybin and similar compounds warrant further clinical investigation.
  • Psychedelics may offer novel treatment avenues for serious mental health conditions.