In 1974, Robert Bjork and William B. Whitten presented subjects with word pairs to be remembered; however, before and after each word pair, subjects had to do a simple multiplication task for 12 seconds.
1974年，Robert Bjork 和 William B. Whitten 给被试展示一些单词对以供记忆，在每一对单词之前和之后，被试需要做12秒的简单乘法。