 Specifically, Arnold wanted to "introduce the idea of emotion differentiation by postulating that emotions such as fear, anger, and excitement could be distinguished by different excitatory phenomena" (Arnold, 1950).With these new ideas, she developed her "cognitive theory" in the 1960s, which specified that the first step in emotion is an appraisal of the situation.According to Arnold, the initial appraisals start the emotional sequence and arouse both the appropriate actions and the emotional experience itself, so that the physiological changes, recognized as important, accompany, but do not initiate, the actions and experiences (Arnold, 1960a).