a capacity that Aristotle calls phantasia-often translated as 'imagination'¹-plays a prominent role in his account of animal motivation. He plainly takes animal motivation to presuppose desire (%ρ,ξι). He appears to think, moreover, that desire, in turn, presupposes phantasia. To see this, consider the following passage from the De Motu Animalium (in what follows, the 'chain of movers' passage): 'Affections suit-ably prepare the organic parts, desire (%ρ,ξι) [sc. suitably prepares] affections, phantasia [sc. suitably prepares] desire; and phantasia arises through thought (ν-ησι) or through perception'
— Hendrik Lorenz
Aristotle is building something precise here, and it is worth slowing down to feel the direction of the chain. Motion does not begin in the muscles, nor even in desire — it begins in *phantasia*, in the image that presents the world as desirable or repellent before any consciously formed intention gets involved. Perception delivers the image; thought can also deliver it; but either way, the image comes first, and desire follows from it, and only then do the body's organs shift into readiness.
What this means is that you do not simply want things. You want things because the soul has already been handed a picture of them, already been shown a shape that calls forward the wanting. The image precedes the appetite. This is not a diminishment of desire but an anatomy of it — the recognition that between the world and your reaching toward it stands something imaginal, formative, prior. Aristotle inherited enough of the earlier Greek grammar to know the soul is not the author of its own motions, only the site where they gather and organize. The chain of movers goes all the way down, and the self enters it somewhere in the middle, not at the top. That is what makes the passage uncomfortable and alive.
Hendrik Lorenz·The Brute Within: Appetitive Desire in Plato and Aristotle·2006