After a methodological premise defining the state of the art as regards the relationship between Albert the Great and the Magistri Artium tradition on De anima, this article examines the second part of De unitate intellectus (ed. Coloniensis 1975), in which Albert expounds the rationes in contrarium to the thesis of the unicity of the intellect. In parallel, an analysis is conducted of the Sed contra section of q. 77 (membr. III), tract. XIII, pars II, of the Summa Theologiae (ed. (...) Borgnet 1895). Beginning with an examination of the formal structure of these sections from the two works and a detailed survey of some of the rationes laid out therein, the article highlights both the aspects common to the two redactions and those which most distinguish them, so as to formulate some hypotheses regarding the reasons and methods behind this reworking carried out by Albert. (shrink)