Effects of discrimination training on fear generalization gradients and perceptual classification in humans.
Effects of discrimination training on fear generalization gradients and perceptual classification in humans.
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DOI：
10.1037/a0031933
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发表时间：
2013-06
影响因子：
1.9
通讯作者：
LaBar KS
中科院分区：
文献类型：
--
作者：
Dunsmoor JE;LaBar KS
为了检验区分性恐惧条件反射对泛化梯度形状的影响，两组参与者首先学习区分两种颜色刺激，一种与电击配对（CS+），另一种明确未配对（CS-）。CS+保持恒定，作为沿沿着蓝绿色维度的中间（模糊）值，而CS-在组间变化，作为沿沿着蓝绿色维度的相对端点。使用高于和低于CS+的光谱波长进行的辨别后测试显示，训练组之间的条件皮肤电导反应的不对称梯度相反，向与CS-相反的方向倾斜。此外，对CS+颜色的感知评级受到辨别性条件反射的影响，蓝色或绿色CS-的颜色值分别导致模糊CS+评级为“绿色”或“蓝色”的频率发生变化。这些结果扩展了在动物文献中的梯度变化的研究结果，并表明，歧视后测试提供了一个更全面的估计歧视性恐惧条件反射的影响，而不是只测试条件刺激的反应。
To examine the effect of discriminative fear conditioning on the shape of the generalization gradient, two groups of participants first learned to discriminate between two color stimuli, one paired with an electrical shock (CS+) and the other explicitly unpaired (CS−). The CS+ was held constant as an intermediate (ambiguous) value along the blue-green color dimension while the CS− varied between groups as opposite endpoints along the blue-green color dimension. Post-discrimination testing, using spectral wavelengths above and below the CS+, revealed opposing asymmetric gradients of conditioned skin conductance responses across training groups that skewed in a direction opposite the CS−. Moreover, perceptual ratings for the color of the CS+ were affected by discriminative conditioning, with the color value of the blue or green CS− inducing a shift in the frequency for ratings of the ambiguous CS+ as either “green” or “blue,” respectively. These results extend findings on gradient shifts in the animal literature, and suggest that post-discrimination testing provides a more comprehensive estimate of the effects of discriminative fear conditioning than testing responses solely to the conditioned stimuli.
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