Thymology, is the study of the human mind by human minds in human terms (Sunwall). Ludwig von Mises introduced this new term to designate the traditional humanistic discipline of psychology: “Thymology is . . . what everybody learns from intercourse with his fellows. It is what a man knows about the way in which people value different conditions, about their wishes and desires and their plans to realize these wishes and desires. It is the knowledge of the social environment in which a man lives and acts.”
As you can see it is subjective but not visible in action. That which is visible in action is part of praxeology.