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Related Experiment Videos

Effects of LSD-25 on classical trace conditioning.

S Siegel1, D X Freedman

  • 1Department of Psychology, McMaster University, Hamilton, Ontario.

Pharmacology, Biochemistry, and Behavior
|June 1, 1988
PubMed
Summary

Lysergic acid diethylamide (LSD-25) enhanced conditioned responses in rabbits, increasing the magnitude of reactions to auditory cues. This suggests LSD-25 amplifies stimulus properties rather than altering learning itself.

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Behavioral Psychology

Background:

  • Understanding how psychoactive substances affect learning and memory is crucial.
  • The eyeblink conditioning paradigm is a well-established model for studying associative learning.
  • Investigating the impact of lysergic acid diethylamide (LSD-25) on conditioned responses provides insights into its neural mechanisms.

Purpose of the Study:

  • To determine the effects of LSD-25 on the excitatory properties of conditioned stimuli.
  • To examine these effects across varying interstimulus intervals (ISIs) in a rabbit eyeblink conditioning model.

Main Methods:

  • Rabbits underwent auditory trace conditioning, pairing a 500-ms auditory stimulus with a 100-ms shock.
  • Conditioning occurred with ISIs of 1000, 2000, 4000, and 8000 ms.

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  • Animals received doses of 35 or 85 µg/kg of LSD-25 before subsequent conditioning sessions.

    • Main Results:

    • Rabbits successfully acquired conditioned responses across all tested interstimulus intervals.
    • LSD-25 administration significantly increased the magnitude of conditioned responses to both positive and negative stimuli.
    • This enhancement was observed consistently across all tested interstimulus intervals.

    Conclusions:

    • Lysergic acid diethylamide (LSD-25) does not appear to alter the fundamental process of discriminative conditioning.
    • The findings suggest that LSD-25 enhances the excitatory properties of both conditioned and unconditioned stimuli.
    • This enhancement of stimulus salience may underlie the observed increase in conditioned response magnitude.