Witnauer James E, Miller Ralph R
State University of New York, Brockport, NY, USA.
Learn Behav. 2013 Mar;41(1):94-106. doi: 10.3758/s13420-012-0088-0.
Most theories of associative learning assert that conditioned responding to a target cue is a monotonically increasing function of unconditioned-stimulus (US) intensity. In a lick suppression preparation with rats, a cue was paired with a 0.4-, 0.6-, 0.8-, 1.0-, 1.2-, or 1.4-mA footshock in Experiment 1a, and with a 0.3-, 0.8-, 1.3-, or 1.8-mA footshock in Experiment 1b. Subsequent suppression in response to the cue was an inverted-U function of the US intensity. In Experiment 2, we demonstrated that massive extinction of the training context and compound conditioning can each attenuate the response decrement caused by training with a high-intensity US. The sometimes-competing-retrieval model (Stout & Miller, Psychological Review 114:759-783, 2007) provides a better fit to these data than do several other models of associative learning.
大多数联想学习理论认为，对目标线索的条件反应是无条件刺激（US）强度的单调递增函数。在一项针对大鼠的舔舐抑制实验中，在实验1a中，一个线索与0.4毫安、0.6毫安、0.8毫安、1.0毫安、1.2毫安或1.4毫安的足部电击配对，在实验1b中，该线索与0.3毫安、0.8毫安、1.3毫安或1.8毫安的足部电击配对。随后对该线索的反应抑制是US强度的倒U形函数。在实验2中，我们证明，对训练环境的大量消退和复合条件作用都可以减弱高强度US训练引起的反应递减。与其他几种联想学习模型相比，有时竞争检索模型（Stout和Miller，《心理学评论》114:759 - 783，2007）对这些数据的拟合更好。
