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Related Experiment Videos

Second-order olfactory-mediated fear-potentiated startle.

Gayla Y Paschall1, Michael Davis

  • 1Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, Georgia 30322, USA. gpaschall@aol.com

Learning & Memory (Cold Spring Harbor, N.Y.)
|December 5, 2002
PubMed
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Rats can learn fear associations with smells and sights through second-order conditioning. Olfactory cues are effective in this fear-potentiated startle paradigm, even with limited training.

Area of Science:

  • Neuroscience
  • Behavioral Psychology
  • Animal Models

Background:

  • Olfactory cues are highly salient for rats, facilitating robust conditioning.
  • Previous research established olfactory cues as effective conditioned stimuli (CSs) in fear-potentiated startle paradigms.
  • Second-order conditioning extends fear associations to previously neutral stimuli.

Purpose of the Study:

  • To investigate second-order fear conditioning using olfactory and visual cues in rats.
  • To determine the efficacy of olfactory stimuli as both first-order (S1) and second-order (S2) conditioned stimuli.
  • To assess the impact of a limited number of training trials on second-order fear conditioning.

Main Methods:

  • Rats were subjected to a fear-potentiated startle paradigm.

Related Experiment Videos

  • First-order olfactory conditioning was established by pairing odor cues with footshock.
  • Second-order conditioning involved pairing a visual cue (light) with the previously conditioned olfactory cue.
  • A small number of training trials were administered across separate days.

    • Main Results:

    • Significant fear-potentiated startle was observed in rats receiving paired first-order and second-order training (Paired/Paired).
    • Surprisingly, a control group (Unpaired/Paired) also exhibited potentiated startle to the visual S2 cue.
    • These findings indicate the effectiveness of olfactory cues in second-order fear conditioning.

    Conclusions:

    • Olfactory cues function as efficient S1 and S2 stimuli in second-order fear-potentiated startle paradigms.
    • Effective second-order fear conditioning can be achieved with a minimal number of training trials.
    • The salience of olfactory cues contributes to their robust role in associative learning and fear memory.