Initial Quotes - page 6
conventional terms such as service work, intellectual labor, and cognitive labor all refer to aspects of immaterial labor, but none of them captures its generality. As an initial approach, one can concieve immaterial labor in two principle forms. The first for refers to labor, that is primarily intellectual or linguistic such as problem solving, symbolic and analytical tasks, and linguistic expressions. This kind of immaterial labor produces ideas, symbols, codes, texts, linguistic figures, images and other such products. We call the other principle form of immaterial labor "affective labor."
Antonio Negri