Abstract
Rats received subcutaneous injections of either nicotine (NIC; 0.05–0.8 mg/kg) or vehicle [VEH (phosphate buffer); 1 ml/kg] immediately after conditioning sessions in a place-conditioning paradigm (delay conditioning). NIC was paired for three delay-conditioning sessions with one environment of a three-compartment place-conditioning apparatus; VEH was paired with another environment. The subjects were then tested for place preference or aversion by determining the proportion of time spent in each compartment during a 15-min test session. Delay conditioning with NIC only produced a dose-related place aversion (greater time was spent in the VEH-paired chamber on test day). Place aversion was evident when NIC, 0.8 mg/kg, was administered either immediately or 5 min after conditioning sessions but not when given 15 min after conditioning. Chlorisondamine (5 μg, lateral ventricle), but not saline, administered 2 weeks prior to delay conditioning with 0.8 mg/kg NIC completely blocked the NIC-induced place aversion. These data suggest that delay conditioning with NIC produces place aversion by a central mechanism. Since standard conditioning (NIC injection immediately before the place-conditioning sessions) with NIC only produced dose-related place preferences (Fudala et al. 1985; Fudala and Iwamoto 1986), the time of administration of the unconditioned stimulus is a strong determinant of the place-conditioning effects of NIC.
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Fudala, P.J., Iwamoto, E.T. Conditioned aversion after delay place conditioning with nicotine. Psychopharmacology 92, 376–381 (1987). https://doi.org/10.1007/BF00210847
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DOI: https://doi.org/10.1007/BF00210847