  A prominent line of analysis holds that the phenomenal character of a mental activity consists in a certain form of awareness of that activity, an awareness that by definition renders it conscious. Since the 1980s a variety of models of that awareness have been developed. As noted above, there are models that define this awareness as a higher-order monitoring, either an inner perception of the activity (a form of inner sense per Kant) or inner consciousness (per Brentano), or an inner thought about the activity. A further model analyzes such awareness as an integral part of the experience, a form of self-representation within the experience. (Again, see Kriegel and Williford (eds.) (2006).)