Unified understanding of retarding and facilitating effect of stimulus preexposure

本研究以大鼠为研究对象，采用条件性厌恶味觉程序，探讨了条件刺激(CS)对条件性厌恶习得的促进作用，而不是抑制作用。当实验中使用自来水作为CS时，在非实验环境中预先暴露于CS会促进厌恶的习得。当盐水而不是自来水(自来水)在不同的环境中预先暴露时，也获得了同样的效果。在没有呈现液体的情况下，简单地预先暴露在该背景下是没有影响的。此外，我们还研究了熟悉一种味道CS对情境相关厌恶的获得的影响。实验结果表明，只有当受试者在家中的笼子里被给予与CS相同的液体时，条件反射语境才被确立为对CS后天厌恶的情景创设。另一方面，当用与CS不同的液体维持动物时，发现条件反射与厌恶事件直接相关。

Using conditioned taste-aversion procedure and rats as the subjects, conditions under which preexposure to conditioned stimulus (CS) facilitates but not retards subsequent acquisition of conditioned aversion were explored. When tap water was used as the CS with animals maintained by salt water through the experiment, preexposure to CS in a context other than experimental one resulted in facilitation of the acquisition of aversion. The same effect was also obtained when salt water rather than CS (tap water) was preexposed in a different context. Simple preexposure to that context without presenting fluid had no effect.The effect of familiarity of a taste CS on the acquisition of context-dependent aversion was also studied. The results of the experiments suggested that only when subjects were given in their home cages a fluid that was identical to the CS through the experiment, conditioning context was established as the occasion setter for the acquired aversion to the CS. When animals were maintained with a fluid that differed from CS, on the other hand, it was found that conditioning context directly associated with the aversive event.