 According to the exemplar theory, the human cognition of concept categories is based on the use of exemplars of concepts.The exemplar theory explains how the human beings learn and use these concept categories.Robert Nosofsky received the first New Investigator Research Award of the Society of Mathematical Psychology (1987), APA's Distinguished Scientific Award for Early Career Contribution to Psychology (1993), and the Troland Award from the National Academy of Sciences (1995).