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Related Experiment Videos

Olfactory-mediated fear-potentiated startle.

Gayla Y Paschall1, Michael Davis

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

Behavioral Neuroscience
|March 16, 2002
PubMed
Summary
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Odor cues paired with footshock can enhance startle responses in rats. This fear-potentiated startle effect is dose-dependent, long-lasting, and can be reduced by the anxiolytic drug buspirone.

Area of Science:

  • Neuroscience
  • Behavioral Psychology
  • Pharmacology

Background:

  • Ambient odor cues previously paired with footshock can potentiate the acoustic startle response in rats.
  • This phenomenon, known as fear-potentiated startle, has implications for understanding fear conditioning and sensory processing.

Purpose of the Study:

  • To investigate parametric factors influencing odorants as conditioned stimuli (CSs) in fear-potentiated startle.
  • To determine the dose-dependency, duration, and effect of an anxiolytic on olfactory-mediated fear-potentiated startle.

Main Methods:

  • Rats were conditioned using a discrete 4-second amyl acetate odor paired with footshock.
  • The acoustic startle response was measured after varying numbers of odor-shock pairings (1, 2, 5, 10).
  • Startle potentiation was assessed at different amyl acetate concentrations and time points post-conditioning, with and without buspirone administration.

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Main Results:

  • Amyl acetate potentiated startle in rats receiving 1-10 odor-shock pairings, but not in untrained rats.
  • Fear-potentiated startle remained significant for up to 40 days and was detectable with short inter-trial intervals (30 s).
  • Potentiation decreased with lower amyl acetate concentrations, and buspirone significantly attenuated the effect.

Conclusions:

  • Odorants can serve as effective CSs in fear-potentiated startle paradigms.
  • The effect is dose-dependent, persistent, and sensitive to anxiolytic intervention.
  • Findings support the use of olfactory cues in studying fear conditioning and its modulation.