Classified measures of curiosity into two categories. First, curiosity is viewed as a motivational state and measured with behavioral indices. Second, he conceptualizes curiosity as a personality trait that is assessed by personality measures.
Tokens alone do not state what is the subject of discourse; and this can, in fact, not be described in general terms; it can only be indicated. The actual world cannot be distinguished from a world of imagination by any description. Hence the need of pronoun and indices, and the more complicated the subject the greater the need of them.