In that mixed space between the rational soul and the body, which is extended yet punctual, corporeal yet thinking, the anima sensitiva sive corporea sensitive or corporeal soul is to be found, bearing the intermediary and mediating powers of imagination and memory; it is they who furnish the spirit with ideas, or at least with the elements it uses to build them, and whenever their functioning their bodily functioning is disturbed, the intellectus acies acuity of the mind 'is defective or hindered; forthwith the eye of the intellect, as if covered with a vail, is wont to be much dulled, or wholly darkened'.