Evidence suggests that visual processing is divided into the dorsal ("how") and ventral ("what") streams. We examined the normal development of these streams and their breakdown under neurological deficit by comparing performance of normally developing children and Williams syndrome individuals on two tasks: a visually guided action ("how") task,…

The size of the effective visual field during the first weeks of life is found to depend on two factors: It increases with age, but contracts in the face of competition from ongoing activity such as fixation of a central stimulus or nonnutritive sucking. (Author/SB)

The effects of perceptual and cognitive factors on information processing in visual periphery were studied in 5- and 8-year-old children and in adults. Subjects judged either the similarity (Study 1) or identity (Study 2) of geometric forms. (Author/SB)

Ancient philosophers, such as Plato and Euclid, believed in an extramission theory of visual perception, which held that there are emissions from the eyes during the act of vision. Three studies, comparing college and elementary school students, found a decrease over age in the belief in extramission and an increase in the belief that vision…