What Zuboff observed was that as intellectual engagement with the work went down, the necessity of concentration and attention went up. What the computer did was make the work so routine, so boring, so mindless, clerical workers had to physically exert themselves to be able to focus on what they were even doing. This transition, from work being about the application of knowledge to work being about the application of attention, turned out to have profound physical and psychological impact on the clerical workers themselves.

How the Personal Computer Broke the Human Body