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Related Concept Videos

Hallucinogens and Psychedelics01:27

Hallucinogens and Psychedelics

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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.
Marijuana, derived from the dried leaves and flowers of the hemp plant, contains...
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The serotonergic psychedelic DOI impairs deviance detection in the auditory cortex.

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Psychedelics like DOI alter auditory cortex function by increasing neural response variability and reducing sensitivity to unexpected sounds. This impacts how the brain processes auditory information during psychedelic experiences.

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Auditory Neuroscience

Background:

  • Psychedelics induce perceptual changes, but neural mechanisms in the auditory system are unclear.
  • Serotonin 2A receptors are key targets for psychedelic compounds.
  • Auditory cortex processes sound information, including frequency tuning and detecting unexpected events.

Purpose of the Study:

  • Investigate how the psychedelic 2,5-Dimethoxy-4-iodoamphetamine (DOI) affects auditory cortical neuron activity.
  • Examine DOI's impact on sound-frequency tuning, neural response variability, and deviance detection.
  • Elucidate neural mechanisms behind psychedelic-induced auditory alterations.

Main Methods:

  • Administered DOI (serotonin 2A receptor agonist) to awake mice.
  • Recorded neural activity in the auditory cortex.
  • Analyzed neuronal responses to auditory stimuli, focusing on frequency tuning, response variability, and deviance detection.

Main Results:

  • DOI did not consistently alter auditory cortical neuron frequency selectivity.
  • DOI increased trial-by-trial variability in neural responses.
  • DOI diminished the neural distinction between standard and oddball auditory stimuli, reducing deviance detection.

Conclusions:

  • DOI dampens the auditory cortex's ability to detect unexpected auditory events.
  • Psychedelics disrupt sensory processing by altering neural response dynamics in the auditory cortex.
  • Findings offer insights into the neural basis of altered auditory perception under psychedelics.