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Forward conditioning with wheel running causes place aversion in rats.

Takahisa Masaki¹, Sadahiko Nakajima

¹Psychology Section, Department of Integrated Psychological Science, Kwansei Gakuin University, Nishinomiya, Hyogo, Japan.

Behavioural Processes

|June 10, 2008

Summary

Forward conditioning with rats, pairing chamber confinement with wheel running, resulted in conditioned aversion. Rats avoided the chamber associated with a 60-minute running opportunity, challenging previous findings.

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Area of Science:

Behavioral neuroscience
Animal behavior research
Learning and memory

Background:

Backward conditioning (running then chamber) in rats can lead to conditioned place preference.
The effect of forward conditioning (chamber then running) on place preference or aversion is less understood.
Understanding stimulus-outcome associations is crucial for behavioral conditioning research.

Purpose of the Study:

To investigate whether a forward conditioning procedure (chamber confinement followed by wheel running) induces place preference or aversion in rats.
To determine the influence of running duration (20 vs. 60 minutes) on conditioned place responses.
To explore the applicability of the opponent-process theory of motivation to these findings.

Main Methods:

Rats were differentially conditioned by confining them in one of two chambers, followed by either a 20- or 60-minute wheel running opportunity, or no running.
The conditioning procedure involved four repetitions of the chamber-then-running pairing.
A choice preference test allowed rats to freely access both chambers to assess their learned associations.

Main Results:

Rats exposed to a 60-minute running opportunity after chamber confinement showed a conditioned place aversion.
These rats spent significantly less time in the chamber paired with running compared to the unpaired chamber.
A 20-minute running opportunity did not yield a significant conditioned aversion in this paradigm.

Conclusions:

Forward conditioning, specifically chamber confinement followed by a prolonged running opportunity (60 minutes), can induce conditioned place aversion in rats.
The duration of the unconditioned stimulus (wheel running) is a critical factor in determining the valence of the conditioned response.
The results suggest that opponent-process theory may help explain the observed aversion, potentially due to the offset of the running experience.