The effects of static and kinetic information for depth on judgments of the relative size of objects placed at different distances was studied in 3- and 7-yr-old children and adults. Subjects viewed either a pair of objects placed on the floor of a textured alley or a projected slide of the identical scene. The presence of motion parallax information for depth was also manipulated. All subjects showed a clear sensitivity to static pictorial depth information in judging objects placed so they projected equal retinal areas. When the retinal size of objects was very different, however, children tended to respond to retinal rather than physical size. Motion parallax information increased responsiveness to depth when a 3-dimensional scene was being viewed, but decreased responsiveness with 2-dimensional projections. The decrease was greater in children than adults.
Bibliographical noteFunding Information:
‘This research was supported in part by a Program Project National Institute of Child Health and Human Development Child Development, University of Minnesota (1 PO1 HD05CQ7). ‘Requests for reprints should be writ to Albert Yonas, Development, University of Minnesota? Minncxapolis, Minnesota, “Now at Boston University.