 Furthermore, the theory lacked an adequate account of the differences between emotions. This objection was influentially voiced by Walter Cannon (1929). According to a common interpretation of the James-Lange theory, what distinguishes emotions from one another is the fact that each involves the perception of a distinctive set of bodily changes. Cannon countered that the visceral reactions characteristic of distinct emotions such as fear and anger are indistinguishable, and so these reactions cannot be what allows us to tell emotions apart.