Paul's principal research interests are in metaphysics and the philosophy of mind.
These ventures, however, sometimes take him into related issues in other fields, such as the philosophy of mind.
He has also published on personhood theory, environmental ethics, and the philosophy of mind.
He writes about cognitive science, phenomenology, and the philosophy of mind.
His primary research interests are philosophy of mind and the theory of knowledge.
In recent years, a central focus for research in the philosophy of mind has been consciousness.
He also made contributions to philosophy of mind and theory of value.
The first topic shapes his work in the philosophies of science, mind, and action.
He is arguably best known for his contributions to philosophy of mind.
The debates that occur within the philosophy of mind have taken center stage.