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Related Concept Videos

CNS Stimulants: Psychedelic Agents01:22

CNS Stimulants: Psychedelic Agents

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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 and Psychedelics01:27

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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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Psychoactive drugs impact brain function, influencing perception, mood, consciousness, cognition, and behavior. These substances are grouped based on their effects and the mechanisms by which they act.
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Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Altered states of consciousness represent significant deviations from one's normal mental state. These deviations can range from subtle changes in awareness to profound transformations in perception, thought processes, and sensory experiences. Altered states of consciousness can be triggered by various factors, including drug use, meditation, hypnosis, illness, or even intense fatigue.
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Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Updated: Aug 11, 2025

Perspectives on Neuroscience
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A complex systems perspective on psychedelic brain action.

Manesh Girn1, Fernando E Rosas2, Richard E Daws3

  • 1Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada.

Trends in Cognitive Sciences
|February 5, 2023
PubMed
Summary
This summary is machine-generated.

Psychedelic-assisted therapy shows promise across diagnoses. Psychedelics may enhance brain flexibility and information sharing by reducing network segregation, offering a new complexity science perspective.

Keywords:
brain dynamicscomplex systemsdynamical systems theoryfunctional neuroimagingpsychedelics

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Complexity Science

Background:

  • Psychedelic-assisted therapy shows transdiagnostic potential.
  • Psychedelics are known to reduce functional segregation in large-scale brain networks.
  • Previous findings on psychedelic brain action remain inconsistent.

Purpose of the Study:

  • To explore psychedelic brain action using a complexity science framework.
  • To reconcile inconsistent findings in neuroimaging studies of psychedelics.
  • To propose a novel perspective on how psychedelics affect brain function.

Main Methods:

  • Review of functional neuroimaging studies on psychedelics.
  • Application of complexity science principles to brain function.
  • Analysis of brain network dynamics and information processing.

Main Results:

  • Psychedelics may induce a more dynamically flexible, diverse, and integrated brain state.
  • This altered brain state is consistent with increased criticality and enhanced information sharing.
  • A complexity science perspective can explain inconsistencies in previous research.

Conclusions:

  • Psychedelics may shift brain function towards a state of heightened criticality.
  • This 'meta' perspective unifies existing findings and suggests new mechanistic models.
  • Understanding psychedelic brain action is crucial for advancing psychedelic-assisted therapy.