 Accounts of introspection differ in what they treat as the proper targets of the introspective process. No major contemporary philosopher believes that all of mentality is available to be discovered by introspection. For example, the cognitive processes involved in early visual processing and in the detection of phonemes are generally held to be introspectively impenetrable and nonetheless (in some important sense) mental (Marr 1983; Fodor 1983). Many philosophers also accept the existence of unconscious beliefs or desires, in roughly the Freudian sense, that are not introspectively available (e.g., Gardner 1993; Velleman 2000; Moran 2001; Wollheim 2003; though see Lear 1998). Although in ordinary English usage we sometimes say we are “introspecting” when we reflect on our character traits, contemporary philosophers of mind generally do not believe that we can directly introspect character traits in the same sense in which we can introspect some of our other mental states (especially in light of research suggesting that we sometimes have poor knowledge of our traits, reviewed in Taylor and Brown 1988; Paulhus and John 1998; Vazire 2010).