Descartes ' response to Gassendi , and to Princess Elizabeth who asked him similar questions in 1643 , is generally considered nowadays to be lacking .
Response did not address what is known in the philosophy of mind as the interaction problem .
Descartes ' response to Gassendi , and to Princess Elizabeth who asked him similar questions in 1643 , is generally considered nowadays to be lacking , because it did not address what is known in the philosophy of mind as the interaction problem .