This article incorporates into Christian theological anthropology some recent findings of a school of scientific researchers in the fields of comparative and developmental psychology. These researchers—namely, Michael Tomasello, Malinda Carpenter, and others affiliated with the Max Planck Institute for Evolutionary Anthropology—have advanced a theologically significant hypothesis about a basic difference between the social‐cognitive capacities of human beings and those of other animals. Their hypothesis is that human beings are distinguished from other animals, in part, because of an ability to share (...) attention with conspecifics in a unique way, namely, by means of a capacity called joint attention. In keeping with the procedures of modern science, they have tested and verified their hypothesis through laboratory experiments on nonhuman primates (chimpanzees in particular) and on human beings (infants and toddlers). In their capacity as scientists, however, they do not attempt show the relevance of their hypothesis for Christian theological anthropology. This article shows how joint attention sheds new light upon the Christian doctrine that human beings are created in the image of the Trinity (imago Trinitatis). (shrink)