This chapter traces the critical reception of Simondon's thought from 1958 to thepresent, arguing that the fragmented and asynchronous publication history of his works — particularly the delayedappearance of ILFI — systematically obscured the deep unity between his two doctoral theses and marginalised thepsychological dimension of his project. Beginning with Denise Van Caneghem's pioneering 1989 tribute, which firstforegrounded the role of psychic individuation and temporality within Simondon's encyclopaedic framework, thechapter charts the gradual emergence of psychological readings across four decades of scholarship. MurielCombes's 1999 monograph on the transindividual relation is examined as a key step in theorising the affective-emotionallayer as the domain in which individuality and collective becoming intersect, with notable connectionsdrawn to Spinoza's ethics. The chapter then surveys subsequent contributions — including work by Barthélémy,Stiegler, Esquenazi, Carrozzini, Tucker, and Celis Bueno — that have progressively centred affectivity, rather thanperception, as the pivotal junction of psychic individuation. Across this critical landscape, a shared lacuna isidentified: the failure to read MEOT andILFI as an integrated whole animated by a single psychological andallagmatic intent. The chapter ultimately demonstrates that a renewed attention to Simondon's psychology, andespecially to affectivity as an ontogenetic force, opens productive lines of inquiry into digital technologies, theposthuman, and the affective turn.