Poling A, Thompson T
Psychopharmacology (Berl). 1977 Mar 16;51(3):289-91. doi: 10.1007/BF00431638.
The effects of delaying food availability 8 s contingent on every, every second, and every fourth lever press maintained by 4,8, and 16% (v/v) ethanol solutions were examined when food was initially available to rats on a fixed-interval 26-s schedule. The delay contingency decreased ethanol-maintained responding at all ethanol concentrations, with the degree of decrease inversely related to the intermittency of the delay schedule and to the ethanol concentration. Such decreases were not evident in the performance of yoked-control animals which received food coincidentally with experimental animals. Temporal changes in food presentation alone therefore could not account for the decreases produced by the delay contingency.
当最初按照固定间隔26秒的时间表向大鼠提供食物时，研究了根据每一次、每两次和每四次按压杠杆而延迟8秒提供食物对分别由4%、8%和16%（v/v）乙醇溶液维持的反应的影响。延迟条件在所有乙醇浓度下均降低了由乙醇维持的反应，降低程度与延迟时间表的间歇性以及乙醇浓度呈负相关。在与实验动物同时获得食物的配对对照动物的表现中，这种降低并不明显。因此，仅食物呈现的时间变化不能解释延迟条件所产生的降低。
