Introspection

Introspection is the process by which someone comes to form beliefs about her own mental states. We might form the belief that someone else is happy on the basis of perception – for example, by perceiving her behavior. But a person typically does not have to observe her own behavior in order to determine whether she is happy. Rather, one makes this determination by introspecting.

When compared to other beliefs that we have, the beliefs that we acquire through introspection seem epistemically special. What exactly this amounts to is discussed in the first part of this essay. The second part addresses the nature of introspection. Though the term “introspection” literally means “looking within” (from the Latin “spicere” meaning “to look” and “intra” meaning “within”), whether introspecting should be treated analogously to looking – that is, whether introspection is a form of inner perception – is debatable. Philosophers have offered both observational and non-observational accounts of introspection. Following the discussion of these various issues about the epistemology and nature of introspection, the third section of this essay addresses an important use to which introspection has been put in philosophical discussions, namely, to draw metaphysical conclusions about the nature of mind.