De la Casa L G, Lubow R E
University of Seville, Seville, Spain.
Q J Exp Psychol B. 2005 Jan;58(1):1-18. doi: 10.1080/02724990444000014.
A number of recent conditioned taste aversion (CTA) experiments have demonstrated a super-latent inhibition (LI) effect--namely, a time-induced increase in the effects of stimulus preexposure when the interval between acquisition and test is spent in a context that is different from the other experimental contexts. Two CTA experiments with rats were conducted to examine the role of primacy in producing super-LI. In Experiment 1, one of two flavours was pre-exposed, following which a second flavour was preexposed. After the second preexposure, animals were conditioned by pairing a compound of the two preexposed flavours with LiCl. The test stage was conducted 1 or 21 days after conditioning, with the interval being spent in either the same or different contexts. In the test, animals were confronted with two bottles, each with one of the two preexposed flavours. Super-LI was obtained only for the first preexposed flavour in the 21-day delay group that spent the interval in a different context. Experiment 2 was designed to ensure that the effects in Experiment 1 represented LI, and to control for order of presentation of the flavours and time between preexposure and acquisition. The results replicated those of Experiment 1. The two experiments support the importance of primacy in the general super-LI experiment where CS-alone preexposure precedes CS-US.
近期的一些条件性味觉厌恶（CTA）实验已经证明了一种超潜伏抑制（LI）效应——也就是说，当习得与测试之间的间隔处于与其他实验情境不同的情境中时，刺激预暴露的效应会随时间增加。进行了两项以大鼠为对象的CTA实验，以检验首因在产生超LI中的作用。在实验1中，两种味道中的一种先进行预暴露，然后对另一种味道进行预暴露。第二次预暴露后，通过将两种预暴露味道的混合物与氯化锂配对来使动物形成条件反射。测试阶段在条件反射后1天或21天进行，间隔期处于相同或不同的情境中。在测试中，给动物提供两个瓶子，每个瓶子装有两种预暴露味道中的一种。仅在间隔期处于不同情境的21天延迟组中，对第一种预暴露味道获得了超LI。实验2旨在确保实验1中的效应代表LI，并控制味道呈现的顺序以及预暴露与习得之间的时间。结果重复了实验1的结果。这两项实验支持了首因在一般超LI实验中的重要性，在该实验中，单独的条件刺激（CS）预暴露先于条件刺激-非条件刺激（CS-US）。
