Williams D A, Frame K A, LoLordo V M
Department of Psychology, Dalhousie University, Halifax, Nova Scotia, Canada.
J Exp Psychol Anim Behav Process. 1991 Apr;17(2):202-9. doi: 10.1037//0097-7403.17.2.202.
Sprague-Dawley rats were placed in the black compartment of a 2 compartment choice apparatus and received a series of unsignaled footshocks at fixed intertrial intervals (ITIs), with ITI duration varied across groups. Contextual conditioning was assessed using place preference and freezing tests. In Experiments 1 and 3, time spent in the unshocked, white compartment in a preference test decreased monotonically with increasing ITI. In Experiment 2, less freezing occurred in the 3-s than in the 60-s groups. An inverted U-shaped relationship between ITI and freezing emerged when a full range of ITIs was used in Experiment 3. The results have implications for the learning-performance distinction and suggest that short ITIs may promote contextual conditioning.
将Sprague-Dawley大鼠置于两室选择装置的黑色隔室中，并以固定的试验间隔（ITIs）接受一系列无信号的足部电击，各实验组的ITI持续时间有所不同。使用位置偏好和僵立试验评估情境条件反射。在实验1和实验3中，在偏好试验中，大鼠在未受电击的白色隔室中停留的时间随着ITI的增加而单调减少。在实验2中，3秒组的僵立行为比60秒组少。当实验3使用了全范围的ITIs时，ITI与僵立之间呈现出倒U形关系。这些结果对学习与表现的区分具有启示意义，并表明较短的ITIs可能促进情境条件反射。
