Grant Douglas S
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada.
Behav Processes. 2009 Nov;82(3):335-9. doi: 10.1016/j.beproc.2009.08.003. Epub 2009 Aug 13.
Pigeons were trained to match 2- and 10-s durations of houselight to red and green comparisons. Following acquisition with a 0-s baseline delay, they were tested with delays of 0, 10 and 20s. There was a strong tendency to choose the short-associated comparison stimulus at both the 10- and 20-s delays (i.e., a choose-short effect) and no bias at the 0-s delay. This test was repeated after baseline training with a constant 10-s delay. As in the first delay test, a choose-short effect was obtained at the 20-s delay. In contrast to the first test, no bias was obtained at the 10-s delay and a strong tendency to choose the long-associated comparison (i.e., a choose-long effect) was obtained at the 0-s delay. Importantly, the choose-long effect was obtained under conditions which insured that the temporal spacing between a 0-s delay trial and the preceding trial was equal to that in training. These results are inconsistent with the temporal summation account of the choose-long effect and are most readily interpreted within a perspective emphasizing the subjective shortening of temporal memories over time.
鸽子经过训练，使其能将持续2秒和10秒的鸽舍灯光与红色和绿色的对比刺激相匹配。在以0秒基线延迟进行习得训练后，对它们进行了0秒、10秒和20秒延迟的测试。在10秒和20秒延迟时，鸽子都有强烈的倾向选择与短时长相关的对比刺激（即选择短效应），而在0秒延迟时没有偏向。在以恒定10秒延迟进行基线训练后，重复了该测试。与第一次延迟测试一样，在20秒延迟时获得了选择短效应。与第一次测试不同的是，在10秒延迟时没有偏向，而在0秒延迟时获得了强烈的选择与长时长相关的对比刺激的倾向（即选择长效应）。重要的是，选择长效应是在确保0秒延迟试验与前一次试验之间的时间间隔与训练中相等的条件下获得的。这些结果与选择长效应的时间总和解释不一致，并且最容易在强调随着时间推移时间记忆主观缩短的视角内进行解释。
