Avatars, methods, apparatuses, computer program products, devices and systems are described that carry out presenting at least one characteristic to at least one member of a population cohort; measuring at least one physiologic activity of the at least one member of the population cohort, the at least one physiologic activity proximate to the at least one presented characteristic; associating the at least one physiological activity with at least one mental state; and specifying at least one avatar attribute based on the at least one mental state.