In "On the Soul" 3.1-5, Aristotle goes beyond the five senses to the general functions of sense perception, the imagination and the so-called active intellect, whose identity was still a matter of controversy in the time of Thomas Aquinas. In his commentary on Aristotle's text, Simplicius insists that the intellect in question is not something transcendental, but the human rational soul. He denies both Plotinus' view that a part of our soul has never descended from uninterrupted contemplation of the Platonic forms, and Proclus' view that our soul cannot be changed in its substance through embodiment. Continuing the debate in Carlos Steel's earlier volume in this series, Henry Blumenthal assesses the authorship of the commentary. He concludes against it being by Simplicius, but not for its being by Priscian. In a novel interpretation, he suggests that if Priscian had any hand in it at all, it might have been as editor of notes from Simplicius' lectures.