 For some scholars, this describes a division distinct from the immediate/dynamic/final trichotomy. Fitzgerald (1966, 78) claims that since emotional, energetic and logical interpretants are actual effects, they must be seen as three sub-types of the dynamic interpretant. This is because dynamic interpretants are described by Peirce as the effect actually produced on the mind. Short (1981, 1996, and 2004) thinks that each of the immediate, dynamic and final interpretants may be further sub-divided into emotional, energetic and logical. In particular, Short thinks that the immediate/dynamic/final trichotomy describes the interpretant at some stage of an end-directed semiotic process, whereas the emotional/energetic/logical trichotomy describes the types of interpretant possible at any given stage.