In three experiments, rats were given intermixed or blocked preexposure to two similar compound stimuli, AX and BX. In Experiment 1, following preexposure, animals were given appetitive conditioning training with the compound AX. A subsequent generalization test showed better discrimination between AX and BX in the group given intermixed than in the one given blocked preexposure. Experiments 2 and 3 assessed the nature of the learning mechanisms underlying this instance of the perceptual learning effect. Experiment 2 assessed the associability of the common and unique elements (X and A); animals in the group given intermixed preexposure showed poorer conditioning with both the X and the A elements than those given blocked preexposure. Experiment 3 further assessed the perceptual effectiveness of the distinctive element A using a superimposition test (the capacity of A to interfere with the conditioned response commanded by an independent conditioned stimulus). The results showed, in line with the outcome of Experiment 2, that the unique element A is more salient following blocked than intermixed preexposure. These results are discussed by reference to current theories of perceptual learning. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

中文翻译：

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感知学习机制：长时间的混合预曝光会降低独特和共同元素的有效性。

在三个实验中，大鼠被混合或阻断预暴露于两种相似的复合刺激，AX 和 BX。在实验 1 中，在暴露前，用化合物 AX 对动物进行食欲调节训练。随后的泛化测试表明，在混合组中 AX 和 BX 之间的区别比在封闭预曝光组中更好。实验 2 和 3 评估了这种感知学习效果实例背后的学习机制的性质。实验 2 评估了共同元素和独特元素（X 和 A）的关联性；混合预暴露组中的动物在 X 和 A 元素方面表现出比封闭预暴露组中的动物更差。实验 3 使用叠加测试（A 干扰由独立条件刺激控制的条件反应的能力）进一步评估了独特元素 A 的感知有效性。结果表明，与实验 2 的结果一致，独特的元素 A 在封闭后比混合预曝光更显着。这些结果通过参考知觉学习的当前理论进行讨论。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。这些结果通过参考知觉学习的当前理论进行讨论。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。这些结果通过参考知觉学习的当前理论进行讨论。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。