"Panic," "exhilaration"

In Bodies and Machines, Mark Seltzer writes:

It should by now be clear...that naturalist discourse registers such a transformation in production in terms of what I have called the double logic of prosthesis: in terms, at once, of panic and of exhilaration. (160)

There was a moment at which this appeal to "panic" and "exhilaration" (whose?) was a common critical move. But in this, the age of affect theory, one wishes to know just what is meant by such words.