Aversive properties of negative incentive shifts in Fischer 344 and Lewis rats

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• 作者：Adam Brewer^a ; ^{abrewer@fit.edu} ; Patrick Johnson^b ; Jeff Stein^c ; Michael Schlund^d ; Dean C. Williams^e
• 关键词：Negative contrast ; Fischer 344 rats ; Lewis rats ; Cost ; Emotionality ; Reward
• 刊名：Behavioural Brain Research
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：319
• 期：Complete
• 页码：174-180
• 全文大小：1018 K
• 卷排序：319

文摘

Negative incentive contrast is characterized by increased response latencies for an upcoming small reward when preceded by a larger reward. We evaluated the aversive properties of negative incentive contrast using an operant, simultaneous contrast paradigm. Fischer 344 and Lewis rats were exposed to incentive shifts across a range of fixed-ratios (costs). Fischer 344 rats showed greater negative incentive contrast than Lewis rats and cost-modulated effects. Negative incentive shifts may elicit negative affective responses in line with emotionality accounts of negative incentive contrast.