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Chronic exposure to very mild unpredictable stress has previously been found to reduce or abolish the acquisition of place preference conditioning. In the present study, chronic mild stress was found to abolish the acquisition of preferences for a distinctive environment paired with morphine (0.7 mg/kg). However, chronic mild stress did not impair the acquisition of place aversion conditioning induced by naloxone (0.7 mg/kg) or picrotoxin (2.0 mg/kg). The results demonstrate that chronic stress does not cause a general impairment of associative learning but, rather, a specific impairment of rewarded behaviour.
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