The central theme of How We Think: Digital Media and Contemporary Technogenesis (University of Chicago Press, 2012) is that we think through, with, and alongside digital media, and that our intense engagements with them have profound neurological, biological, and psychological consequences, as well as obvious social, economic, institutional and political effects. Each chapter explores this proposition through a specific lens, from transformed protocols for academic research and pedagogy, to attentional economies, to changed perceptions of space and time, to the interactions of narrative and database in contemporary print and electronic novels. How We Think: A Digital Companion presents material for readers to explore some of these themes by constructing their own lens through which to construct questions and arrive at their own answers.