I haven't the time to write this down right now, but hopefully I'll remember what the insight was when I read the heading. It has to do w what STAq said (in commentary on De sensu) re mere sensation as judgment (think Husserlian synthesis here). This is the condition for the possibility of perception at the highest level (thinking of vis cogitativa/estimativa here)... and it has to do with the fact that perception is never of just this or that form of this or that thing, but of the whole concrete environment in relation to the perceiver (to misquote Phillipians: "...as something to be grasped at.") In other words, it has to do with holism vs. particularism, being strongly in in support of a view of perception as holistic... and it has to do with Aristotle's mention somewhere in De anima that the unity of perceptual powers in the same subject makes possible our perception of the unity of perceptual objects in the same object thing...but it extends this poin...
Commentary and discussion regarding science, faith and culture by Leo White