Final Conclusion: Descartes's mind and body are really distinct.
Aristotle did not believe in Platonic Forms, existing independently oftheir instances. Aristotelian forms (the capital ‘F’ hasdisappeared with their standing as autonomous entities) are thenatures and properties of things and exist embodied in thosethings. This enabled Aristotle to explain the union of body and soulby saying that the soul is the form of the body. This means that aparticular person's soul is no more than his nature as a humanbeing. Because this seems to make the soul into a property of thebody, it led many interpreters, both ancient and modern, to interprethis theory as materialistic. The interpretation of Aristotle'sphilosophy of mind—and, indeed, of his whole doctrine ofform—remains as live an issue today as it was immediately afterhis death (Robinson 1983 and 1991; Nussbaum 1984; Rorty and Nussbaum,eds, 1992). Nevertheless, the text makes it clear that Aristotlebelieved that the intellect, though part of the soul, differs fromother faculties in not having a bodily organ. His argument for thisconstitutes a more tightly argued case than Plato's for theimmateriality of thought and, hence, for a kind of dualism. He arguedthat the intellect must be immaterial because if it were material itcould not receive all forms. Just as the eye, because of itsparticular physical nature, is sensitive to light but not to sound,and the ear to sound and not to light, so, if the intellect were in aphysical organ it could be sensitive only to a restricted range ofphysical things; but this is not the case, for we can think about anykind of material object (De Anima III,4; 429a10–b9). Asit does not have a material organ, its activity must be essentiallyimmaterial.
Conclusion: Descartes's mind is really distinct from his body.
René Descartes: The Mind-Body Distinction
Descartes's Second Argument for the Real Distinction of Mind andBody
First Conceptual Premiss: Descartes cannot in thought divide his mindinto parts, i.e., he cannot conceive of his mind as divisible.
Descartes’s changing mind - ScienceDirect
First Conclusion: God can bring it about that Descartes is himself amind without a body, and also bring it about that his body exists apartfrom him as a mind.