The present study relies on a greatly improved re-edited text of Ibn B a s (d. 1139) commentary on De anima, Kit?b al-nafs.Here, the author showsthat in keeping with the Aristotelian model, Ibn B a conceptualizes psychology as a natural science, but at the same time, ultimately turns his understanding of natural science into fundamental science."

This volume is based on the 35th Cologne Medieval Studies Conference on the Duration of Being.