This research program investigates how typically developing infants and children acquire the ability to classify faces into different categories according to their gender, race, age, and species and the ability to recognize individual faces from within these categories. First, researchers will examine infants and children from several countries to capitalize on their naturally occurring experiential differences with faces of different races, genders, ages, and species. Second, they will use a training paradigm to experimentally induce different experiences with faces of various categories to infants and children. The results from this research will provide the normative bench mark against which clinicians can evaluate the face processing abilities of children with various developmental and neurological disorders (e.g., autism, William's syndrome, developmental prosopagnosia). The methodologies developed from the program of research will enable clinicians to develop appropriate assessment tools to identify and diagnose infants and children with potential face processing problems. Further, results from training paradigm can be used to develop evidence-based intervention programs to treat face processing deficits in childhood. Finally, research findings may also provide information about the origin of social biases such as race-, gender-, and age-stereotypes and prejudices, and methods to reduce them.