ABSTRACT
Feeling “blue,” depressed, resentful, anxious, angry, afraid, being in love, jealous, and so on, are only a few of the rich variety of affective reactions in which humans are involved. Not only are they important as reactions proper to objects that “move” us, but they occur concurrently as phases of such interactions as fighting, working, playing, eating, dancing, skating, waiting, and the like. In fact, we doubt if they are ever totally absent in the behavioral repertoire of organisms.
