Perry argues that certain sorts of indexicals are 'essential', in the sense that they cannot be eliminated in favor of descriptions. This paper also introduces the influential idea that certain sorts of indexicals play a special role in thought, and have a special connection to action.

Findings and theories in cognitive science have been increasingly important in many areas of philosophy, especially philosophy of mind, epistemology, and philosophy of language. The time is ripe to examine its potential applications to moral theory as well. This article does not aspire to a comprehensive treatment of the subject. It merely aims to illustrate the ways in which research in cognitive science can bear on the concerns of moral philosophers. For present purposes the label 'cognitive science' is used fairly (...) broadly, encompassing, for example, the study of emotion or "hot" cognition as well as "cold" cognition. (shrink)