I argue that an activity theory--which regards emotions as interdependent and interpenetrating with other cultural phenomena-- is central for the cultural psychology of emotions. Activity theory maintains that the cultural characteristics, development, and functions of emotions are shaped by social activities and cultural concepts. I explain the relation of biological to cultural factors in shaping the characteristics and development of emotions. Evidence is presented which shows that biological processes-- hormones, neurotransmitters, autonomic reactions-- underlie (mediate) but do not determine emotional qualities and expressions. Particular qualities and expressions are determined by cultural processes and factors. The etymology of "...