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CNS Stimulants: Psychedelic Agents01:22

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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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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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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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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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Related Experiment Video

Updated: Jun 17, 2026

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Asking questions of psychedelic microdosing.

Lindsay P Cameron1

  • 1Graduate Program in Neuroscience, University of California, Davis, Davis, United States.

Elife
|March 2, 2021
PubMed
Summary
This summary is machine-generated.

Psychedelic microdosing benefits for mood and cognition may stem from the placebo effect, according to citizen science research. This suggests psychological factors play a significant role in perceived outcomes.

Keywords:
citizen scienceexpectationshumanmedicinemicrodosingneuroscienceplacebopsychedelicsself-blinding

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Area of Science:

  • Neuroscience
  • Psychology
  • Citizen Science

Background:

  • Microdosing psychedelics is increasingly popular for purported mood and cognitive enhancement.
  • Scientific understanding of these effects, particularly the role of expectation, remains incomplete.

Purpose of the Study:

  • To investigate the subjective effects of psychedelic microdosing.
  • To differentiate between actual pharmacological effects and placebo responses in a real-world setting.

Main Methods:

  • Utilized a citizen science framework, gathering data from individuals self-administering microdoses.
  • Employed rigorous data collection protocols to assess mood and cognitive changes over time.

Main Results:

  • Observed improvements in mood and cognition were statistically comparable to placebo effects.
  • No significant differences were found between microdosing and placebo conditions when controlling for expectation.

Conclusions:

  • The perceived benefits of psychedelic microdosing are likely attributable to the placebo effect.
  • Further research should focus on the psychological mechanisms underlying these reported improvements.