Contrary to Piaget's predictions, adolescent retardates and 9-year-old normals were more susceptible to the Oppel-Kundt Illusion than high school sophomores and adults. No group differences were found on the Poggendorf Illusion. (MH)

The present study was designed to clarify issues concerning the development of the relative capabilities of modal systems when information acquisition is equated for the modalities by sequential presentation. (Author)

Research was designed to determine whether developmental differences in sensitivity to more peripherally presented material could be found under conditions in which overt eye movements during the presentation of task material were not possible. (Author)

In order to investigate what concepts young children acquire that break down their inability to view spatial situations objectively, three groups of 16 children each were administered two tasks: (1) a box task, in which the child was asked to predict the location of objects upon a change in his location; and (2) a Piagetian task, in which the…

The implications of the results of this study for theories of cross-modal performance are discussed. (Author)

Results supported Piaget's viewpoint that mental imagery and general symbolic functioning are dependent on the growth of intelligence with respect to the preadolescent period. (Author)

Suggests specific ways in which the classroom teacher can teach to a child's perceptual and instructional weakness through his strengths. Notes that the goal is to provide instruction in the subject area, not just in perceptual skills. Bibliography. (RW)