This man claimed that the (*) "seat of the soul" is in the pineal gland to resolve the mind-body problem.
An ontological argument proposed by this thinker argues that the concept of a mountain cannot be separated from the concept of a valley. This thinker dedicated a work to Princess Elisabeth of Bohemia that analyzes the Passions of the Soul. This man claimed that the (*) "seat of the soul" is in the pineal gland to resolve the mind-body problem. One of this man's books imagines an "evil demon" responsible for altering the senses, to which he responds by doubting everything but his existence. For 10 points, name this French philosopher who declared in his Meditations on First Philosophy that "I think, therefore I am."
An ontological argument proposed by this thinker argues that the concept of a mountain cannot be separated from the concept of a valley.
Rene Descartes