1. A method comprising: presenting to at least one member of a population a plurality of avatars associated with at least one instance of media content; measuring at least one physiologic activity of the at least one member of the population, the at least one physiologic activity proximate to at least one presented avatar among the plurality of avatars associated with at least one instance of media content, wherein the measuring at least one physiologic activity of the at least one member of the population, the at least one physiologic activity proximate to at least one presented avatar among the plurality of avatars associated with at least one instance of media content includes measuring at least one brain activity surrogate marker of the at least one member of the population, the at least one brain activity surrogate marker proximate to the at least one presented avatar among the plurality of avatars associated with at least one instance of media content; searching at least one database to identify at least one mental state corresponding to the at least one physiologic activity; associating the at least one physiologic activity with the at least one mental state; and identifying at least one preferred instance of media content based on the at least one mental state.