B. C. Duchaine, Developmental prosopagnosia with normal non-face individual item discrimination Abstract Bill Choisser is a developmental prosopagnosic who reports no object recognition difficulties. Work with other prosopagnosics has shown normal object recognition performance, but these reports did not include measures of response time. This leaves open the possibility that abnormally long latencies on these object recognition tests allowed these subjects to pull their accuracy scores into the normal range. I have run a variety of object recognition tests with Bill that measured both discrimination and response time. Bill showed difficulties with unfamiliar face recognition tasks, but did not show any impairments with shoes, cars, horses, houses, or natural scenes. This demonstrates that even when response time is measured face recognition can dissociate from object recognition.