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• W2981448347 startingPage "172816" @default.
• W2981448347 abstract "Increased subjective discounting of delayed rewards is associated with substance abuse, and individuals tend to discount their drug of choice at a greater rate compared to monetary rewards. While there is evidence indicating that increased delay discounting (DD) is a risk factor for substance abuse, some results suggest that exposure to drugs of abuse also increases DD, but effects are mixed. The current study examined whether ethanol pre-exposure increases DD and if an ethanol reinforcer would be discounted at a greater rate than sucrose. Alcohol preferring (P) rats were pre-exposed to either ethanol or sucrose using an intermittent access protocol (IAP) for 8 weeks. Then animals completed an operant fixed choice procedure where each pre-exposure group was split into either an ethanol or sucrose reinforcer group. Afterwards, animals completed an adjusting delay DD task using the same groups as the fixed choice task. Animals that received access to ethanol in the IAP showed increased delayed reward preference in a delay and session dependent manner. Specifically, ethanol pre-exposed animals took more sessions to decrease their preference for the delayed reward at longer delays. In the adjusting delay task, no differences in mean adjusting delays were seen, but ethanol pre-exposure impaired animals' ability to reach stability criteria. The observed results are not consistent with ethanol pre-exposure causing a change in DD. Rather they indicate ethanol pre-exposure impaired animals' ability to reallocate their behavior in response to a change in reinforcer contingencies. The current findings extend prior results showing alcohol naïve P rats exhibit both increased DD and decreased response inhibition (Beckwith and Czachowski 2014, 2016) by demonstrating that after alcohol exposure they exhibit a form of behavioral inflexibility. Hence, a two-hit genetic vulnerability/environmental acceleration of addictive behavior is supported." @default.
• W2981448347 created "2019-11-01" @default.
• W2981448347 creator A5045884851 @default.
• W2981448347 creator A5077618945 @default.
• W2981448347 date "2019-12-01" @default.
• W2981448347 modified "2023-09-24" @default.
• W2981448347 title "Ethanol pre-exposure does not increase delay discounting in P rats, but does impair the ability to dynamically adapt behavioral allocation to changing reinforcer contingencies" @default.
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• W2981448347 doi "https://doi.org/10.1016/j.pbb.2019.172816" @default.
• W2981448347 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6878995" @default.
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