Jonkman Sietse, Kosaki Yutaka, Everitt Barry J, Dickinson Anthony
Behavioural and Clinical Neuroscience Institute and Department of Experimental Psychology, University of Cambridge, Downing Site, Cambridge, United Kingdom.
Behav Processes. 2010 Mar;83(3):276-81. doi: 10.1016/j.beproc.2009.12.017. Epub 2010 Jan 12.
Different groups of rats received different amounts of training to lever press for a food reinforcer before an aversion was conditioned to the food. This devaluation of the reinforcer reduced responding in both subsequent extinction and reinforced tests of responding to a degree that was independent of the amount of instrumental training. Moreover, interpolating context extinction between aversion conditioning and the extinction test reduced the magnitude of the devaluation effect, thereby indicating that Pavlovian contextual conditioning may play a role in the instrumental devaluation effect.
在对食物形成厌恶之前，不同组的大鼠接受了不同量的按压杠杆以获取食物强化物的训练。强化物的这种贬值在随后的消退和对反应的强化测试中均降低了反应，其降低程度与工具性训练的量无关。此外，在厌恶条件作用和消退测试之间插入情境消退，可降低贬值效应的幅度，从而表明巴甫洛夫式情境条件作用可能在工具性贬值效应中起作用。
