ABSTRACT
Our last lecture touched many things lightly. From now on we must prepare ourselves for more strenuous undertakings. In that lecture we found that the behaviorist is constantly working with stimuli whose effect on the human organism is unknown. He seeks to find out what kind of reaction they will call forth when presented singly or in combination. He varies not only the combination in which they are presented but their intensity and the length of time they are allowed to exert their effect.
