Full Idea
According to phenomenology, thought depends on man's relations with the world - with which the brain is necessarily in agreement because it is drawn from these relations.
Gist of Idea
Phenomenology says thought is part of the world
Source
G Deleuze / F Guattari (What is Philosophy? [1991], Conclusion)
Book Reference
Deleuze/Guattari: 'What is Philosophy?' [Verso 1994], p.209
A Reaction
The development of externalist views of mind, arising from the Twin Earth idea, seems to provide a link to continental philosophy, where similar ideas are found in Husserl, Sartre and Merleau-Ponty. So study science, psychology, or sociology?