Descartean

But Idea in its Descartean sense will apply with equal aptness to the thoughts which are traceable to the feelings.

Another feature that distinguishes James’ self from the Descartean Cogito is the inclusion of the body as part of the (material) self.

In history books, ideas like Descartean dualism get presented as inevitable. Their implications are not examined, nor are they rigorously criticized. Descartean thought came along, and it caught on, but the reasons why it caught on are not examined.