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Hallucinogens.

David E Nichols1

  • 1Department of Medicinal Chemistry and Molecular Pharmacology, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, IN 47907-2091, USA. david.e.nichols.l@purdue.edu

Pharmacology & Therapeutics
|February 6, 2004
PubMed
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Psychoactive hallucinogens, considered safe, primarily act on serotonin 5-HT(2A) receptors, influencing brain activity and potentially aiding in treating addiction and psychiatric disorders.

Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Cognitive Science

Background:

  • Hallucinogens (psychedelics) are psychoactive substances known for profoundly altering perception and cognition.
  • Historically used in various cultural contexts, their modern scientific investigation began in the 1950s.
  • Early research linked hallucinogens to the serotonin system, specifically serotonin (5-HT).

Purpose of the Study:

  • To explore the neurobiological mechanisms underlying the effects of hallucinogens.
  • To investigate the role of serotonin 5-HT(2A) receptors in hallucinogen action.
  • To examine the relationship between brain activity, altered states of consciousness, and hallucinogen effects.

Main Methods:

  • Review of existing research on hallucinogen pharmacology and neurobiology.

Related Experiment Videos

  • Focus on the interaction of hallucinogens with serotonin 5-HT(2A) receptors.
  • Analysis of in vivo human brain imaging studies using [(18)F]fluorodeoxyglucose.

    • Main Results:

    • Hallucinogens stimulate serotonin 5-HT(2A) receptors, particularly on neocortical pyramidal cells.
    • This stimulation increases cortical glutamate levels, affecting thalamocortical interactions.
    • Brain imaging shows increased prefrontal cortical metabolism, correlating with psychological effects in altered states of consciousness.

    Conclusions:

    • The serotonin 5-HT(2A) receptor is crucial for cognitive processing, including working memory.
    • Hallucinogens offer potential as tools for cognitive neuroscience research.
    • Therapeutic applications for alcoholism, substance abuse, and psychiatric disorders are possible.