Individual differences in novelty seeking on the playground maze predict amphetamine conditioned place preference

Area of Science:

• Neuroscience
• Behavioral Pharmacology

Background:

• Novelty seeking behavior in rodents can predict responses to drugs like amphetamine.
• Previous studies indicate a disconnect between novelty-induced activity and amphetamine-conditioned place preference.

Purpose of the Study:

• To investigate the predictive value of a novel playground maze test for individual differences in amphetamine response.
• To determine if novelty seeking behavior correlates with amphetamine-conditioned place preference and locomotor activity.

Main Methods:

• Rats were assessed for novelty seeking using the playground maze.
• Individual differences in novelty seeking were used to categorize rats as high or low novelty seekers.
• The effects of amphetamine (1 and 3 mg/kg) on locomotor activity and conditioned place preference were measured.

Main Results:

• Individual differences in novelty seeking did not predict amphetamine-induced locomotor activity after single or repeated injections.
• High novelty-seeking rats exhibited a significantly greater amphetamine-conditioned place preference compared to low novelty-seeking rats.
• These findings suggest a specific relationship between novelty seeking and the rewarding effects of amphetamine.

Conclusions:

• The playground maze effectively categorizes rats based on novelty-seeking behavior.
• Novelty seeking is a predictor of amphetamine-conditioned place preference, but not amphetamine-induced locomotor activity.
• Results support a neuropharmacological link between novelty seeking and drug reward pathways.