Although clinical, social, and cognitive psychologists all use the con
cept of ''cognition,'' they often use it in different ways to refer to
different phenomena. We offer a heuristic framework for distinguishin
g among three general uses of the word cognition, and apply this frame
work to an evaluation of the experiential avoidance concept presented
by Hayes and Gifford (this issue). While acknowledging the promise of
such work, we raise concerns about its possible limitations. We recomm
end that clinical applications of the cognition concept be grounded in
the theories and methods of contemporary cognitive and neural science
s. In support of our recommendation, we present three examples from ex
periments from our own research.