Moskowitz H, Kitzes L
J Exp Anal Behav. 1966 Sep;9(5):515-9. doi: 10.1901/jeab.1966.9-515.
A discrimination box containing two levers with a light above each was used to train eight rats to press beneath the brighter light for a milk reinforcer. The brighter light was held constant and the comparison light was varied to produce 12 brightness differences. The animals were run under two experimental methods: the block method in which each brightness level comparison was presented for a block of 11 contiguous trials, and the staircase method in which the sequence of brightness comparisons was determined by the correctness of the response on the preceding comparison. The block method produced a smaller differential brightness threshold and a larger change in discrimination performance for stimulus magnitude changes than did the staircase method.
一个装有两个杠杆且每个杠杆上方都有一盏灯的辨别箱被用来训练八只大鼠，使其在较亮的灯光下按压杠杆以获取牛奶奖励。较亮的灯光保持不变，而比较灯光则进行变化，以产生12种亮度差异。这些动物在两种实验方法下进行测试：组块法，即每个亮度水平的比较会连续进行11次试验的组块；以及阶梯法，即亮度比较的顺序由前一次比较的反应正确性决定。与阶梯法相比，组块法产生的差异亮度阈值更小，并且对于刺激强度变化，辨别性能的变化更大。
