 It is evident, too, that the meaning of “I” cannot perform the duties of an interpersonal Fregean sense (discussed in  Section 2.2).  The rule determining the reference of an utterance of “I” (what Kaplan calls its character) is not the same as the contribution such an utterance makes to the communicated content (the cognitive significance of the utterance) on a particular occasion of use. Indeed, whereas “I” has a fixed character, it contributes different senses when uttered by different people (see Frege 1918–1919 [1956: 296]).