Abstract

Acute parachlorophenylalanine (pCPA) pretreatment (150 mg/kg, i.p., 24 h beforehand) potentiated facilitatory effects of mescaline (39.6 mg/kg i.p.) on shuttlebox escape/avoidance in hooded rats, tested in two different situations: 1. during aquisition of avoidance behavior (Experiment 1); and 2. in stable pretrained poor avoiders (Experiment 2). pCPA alone did not influence avoidance behavior in either situation. Mescaline, with pCPA pretreatment, may be associated with long-term behavioral effects; all rats treated with this combination were later found to be poor avoiders, unable to achieve a stable baseline of good avoidance. pCPA significantly depleted brain norepinephrine and dopamine, as well as serotonin, measured after testing in the second situation.

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