Conversation so far:
What was one of René Descartes' philosophical writings?
The Passions of the Soul
Did the theory of psycosomatic processes by René Descartes become popular?
René Descartes' works would have a lasting impact on ideas concerning what literature and art should be, specifically how it should invoke emotion.
How did René Descartes arrive at this conclusion?
René Descartes states that the quality of reasoning depends on knowledge, because a well-informed mind will be more capable of making good choices.
Does René Descartes explain how the senses connect to thought?
René Descartes argues that sensory perceptions come to him involuntarily, and are not willed by him.

Question: Did he have any other philosophical theories?
Self-contained rewrite: Did René Descartes have any other philosophical theories?