 A central concern with Ockham’s account, raised by Walter Chatton and responded to by Wodeham, was the character of these apparition causing “after-images”. For Ockham, the after images were not caused by the object, but by a lingering impression distinct from the object or impression-causing species. For Chatton, it could not be overlooked that these after-images appeared as if they were the object, not as if they were some left-over impression caused by the object. Thus, he argued that the after-images are caused by the lingering of the representative species of the object, even after the object is no longer present. Chatton was therefore willing to admit that intuition of a non-present object was possible, as long as its representative species lingered.