Abstract:
:Previous studies have shown that ethanol produces conditioned place preference (CPP) in mice when injections are given immediately before exposure to the conditioned stimulus (CS). Paradoxically, however, injection of ethanol immediately after the CS produces conditioned place aversion (CPA). Four experiments were conducted to characterize the parametric boundaries of CPA produced by post-CS ethanol exposure. Experiment 1 showed that CPA is positively related to ethanol dose, with significant CPA at 2 and 4 g / kg, but not at 1 g / kg. Experiment 2 revealed an inverse relationship between CPA and trial duration, i.e. significant CPA occurred when the trial duration was 5, 15 or 30 min, but not when it was 60 or 90 min. Experiment 3 indicated that ethanol pre-exposure (eight daily injections) significantly reduced subsequent development of CPA. Finally, experiment 4 showed that repeated exposure to the CS alone (six 30 min exposures to each CS) after CS-ethanol pairings produced complete extinction of CPA. The same extinction procedure also completely eliminated CPP induced by pre-CS injections of ethanol. Overall, these studies demonstrate that CPA induced by post-CS ethanol injection is influenced by many of the same variables that affect CPP produced by pre-CS ethanol injection in mice. However, these findings do not resolve the issue of whether the 'before-versus-after' effect in ethanol place conditioning is better explained by assuming ethanol produces only rewarding effects or by assuming that ethanol produces both rewarding and aversive effects.
journal_name
Behav Pharmacoljournal_title
Behavioural pharmacologyauthors
Cunningham CL,Henderson CMdoi
10.1097/00008877-200011000-00006subject
Has Abstractpub_date
2000-11-01 00:00:00pages
591-602issue
7-8eissn
0955-8810issn
1473-5849journal_volume
11pub_type
杂志文章abstract::Pigeons were trained to discriminate 5mg/kg pentobarbital from saline under several multiple fixed-ratio fixed-interval schedules of food presentation. The following schedules were studied: multiple fixed-ratio 40 fixed-interval 18s (mult FR40 FI18), mult FR10 FI18s, mult FR10 FI180s and mult FR90 FI10s. After respond...
journal_title:Behavioural pharmacology
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journal_title:Behavioural pharmacology
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