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Taste aversion learning induced by forced swimming in rats.
Sadahiko Nakajima1, Takahisa Masaki
1Department of Integrated Psychological Science, Kwansei Gakuin University, Nishinomiya, Hyogo 662-8501, Japan. nakajima@kwansei.ac.jp
Physiology & Behavior
|February 27, 2004
Summary
Forced swimming can make rats dislike tastes they consumed beforehand, a novel finding in conditioned taste aversion. This effect can even reduce aversion learned from poisoning.
Area of Science:
- Behavioral Neuroscience
- Learning and Memory
Background:
- Conditioned taste aversion (CTA) is a learned aversion to a taste associated with negative experiences.
- Previous research indicates that physical activity, like swimming, can attenuate poison-induced CTA.
Purpose of the Study:
- To investigate if forced swimming can independently induce conditioned taste aversion in rats.
- To explore the novel phenomenon of swimming-induced CTA and its potential to modify established aversions.
Main Methods:
- Experiment 1: Rats received a taste solution followed by either swimming or poisoning, with subsequent taste intake measured.
- Experiment 2: A differential conditioning procedure paired one taste solution with swimming and another with no consequence, followed by intake measurements.
Main Results:
- Rats exposed to taste-swimming sequences showed reduced intake of the tasted solution compared to controls.
- Swimming attenuated the taste aversion conditioned by poisoning.
- Differential conditioning confirmed that swimming alone can induce a conditioned taste aversion.
Conclusions:
- Forced swimming is capable of inducing conditioned taste aversion in rats.
- This swimming-induced CTA is a novel finding and can modulate aversions learned through other means, such as poisoning.