 The two most commonly cited classes of introspectible mental states are attitudes, such as beliefs, desires, evaluations, and intentions, and conscious experiences, such as emotions, images, and sensory experiences. (These two groups may not be wholly, or even partially, disjoint: Depending on other aspects of her view, a philosopher may regard some or all conscious experiences as involving attitudes, and/or she may regard attitudes as things that are or can be consciously experienced.) It of course does not follow from the fact (if it is a fact) that some attitudes are introspectible that all attitudes are, or from the fact that some conscious experiences are introspectible that all conscious experiences are. Some accounts of introspection focus on attitudes (e.g., Nichols and Stich 2003), while others focus on conscious experiences (e.g., Hill 1991; Goldman 2006; Schwitzgebel 2012); and it is sometimes unclear to what extent philosophers intend their remarks about the introspection of one type of target to apply to the other type. There is no guarantee that the same mechanism or process is involved in introspecting all the different potential targets.