Fetterman J G, Dreyfus L R, Stubbs D A
Department of Psychology, Arizona State University, Tempe 85287.
J Exp Psychol Anim Behav Process. 1989 Jul;15(3):253-63.
Trained pigeons to make discriminations on the basis of the ratio of two stimulus durations. A red light of one duration was followed by a green light of a different duration, with 900 red-green pairs intermixed over trials. A choice followed the red-green pair; a response to a green side key was reinforced if the red-green ratio was less than a criterion ratio, and a response to a red side key was reinforced if the ratio exceeded the criterion. Reinforcement depended on whether red or green was longer under the basic condition; in other conditions, however, reinforcement depended on whether one duration was two or four times longer than the other. Sensitivity was similar across conditions, for the basic shorter-longer rule, and for the more complex rule of one duration as two or four times the other. Most choices were made on the basis of the ratio relation between the two durations and according to Weber's law. These results extend the findings of Dreyfus, Fetterman, Smith, and Stubbs (1988), and provide a new methodology for psychophysical scaling with animals.
训练鸽子根据两种刺激持续时间的比例进行辨别。一种持续时间的红灯之后是另一种持续时间的绿灯，在试验过程中混合有900对红-绿组合。红-绿组合之后是一个选择；如果红-绿比例小于标准比例，对绿色侧键的反应得到强化，如果比例超过标准，则对红色侧键的反应得到强化。在基本条件下，强化取决于红色还是绿色持续时间更长；然而，在其他条件下，强化取决于一种持续时间是否比另一种长两倍或四倍。对于基本的短-长规则以及一种持续时间是另一种的两倍或四倍这种更复杂的规则，不同条件下的敏感性相似。大多数选择是基于两种持续时间之间的比例关系并根据韦伯定律做出的。这些结果扩展了德雷福斯、费特曼、史密斯和斯塔布斯（1988年）的研究发现，并为动物心理物理学标度提供了一种新方法。
