A Developmental Deficit in Localizing Objects from Vision

We describe a college student, A.H., with a developmental deficit in determining the location of objects from vision. The deficit is selective in that (a) localization from auditory or tactile information is intact; (b) A.H. reports the identity of mislocalized objects accurately; (c) visual localization errors preserve certain parameters of the target location; and (d) visual localization is severely impaired under certain stimulus conditions, but nearly intact under other conditions. These results bear on the representation and processing of location information in the visual system, and also have implications for understanding developmental dyslexia.