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• W2050470315 abstract "Previously, we demonstrated that the early life stress of neonatal isolation facilitates acquisition of cocaine and food self-administration in adult female rats. We now test whether it enhances responding for these reinforcers after operant performance is established. Adult female rats were derived from litters that were either subjected to neonatal isolation (1 h/day isolation; postnatal days 2–9) or were nonhandled and assigned to one of two experiments. In Experiment 1, female rats well trained to self-administer cocaine were tested under a fixed-ratio 3 (FR3) schedule with several cocaine doses (0.0625–1.0 mg/kg/infusion) and under a progressive-ratio (PR) schedule (0, 0.5, and 1.0 mg/kg/infusion cocaine). In Experiment 2, female rats well trained to respond for food reinforcers under an FR15 schedule were tested under two PR schedules. Results show that neonatal isolation enhanced responding for cocaine under both schedules of reinforcement and increased responding for food under a PR schedule of reinforcement. These data extend our previous acquisition study in female rats to show that neonatal isolation enhances responding under maintenance conditions. These enduring behavioral changes may relate to the ability of neonatal isolation to increase striatal dopamine responses to psychostimulants, effects we showed previously in infant and juvenile rats." @default.
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• W2050470315 date "2005-06-01" @default.
• W2050470315 modified "2023-09-26" @default.
• W2050470315 title "Heightened Cocaine and Food Self-Administration in Female Rats with Neonatal Isolation Experience" @default.
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• W2050470315 doi "https://doi.org/10.1038/sj.npp.1300779" @default.
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