Descartes affords several notions of consciousness as he explains the characteristics of the diverse features of human thought from infancy to adulthood and from dreaming to attentive wakefulness. I will argue that Descartes provides the resources for a rich and coherent view of conscious mentality from rudimentary consciousness through reflexive consciousness to consciousness achieved by deliberate, attentive reflection. I shall begin by making two general yet important remarks concerning the conceptual starting points of my investigation.