Explains the hierarchic structure of the mammalian visual system. Proposes a model in which feedback pathways serve to modify sensory stimuli in ways that enhance and complete sensory input patterns. Investigates the functioning of the system through computer simulations. (ML)

Kaufman Assessment Battery for Children scores obtained by 20 Down's syndrome children (ages 8-12) were compared with scores of 20 younger siblings and 20 nonretarded children matched for mental age. Among results were that Down's syndrome children performed significantly better on subtests employing visual as opposed to auditory channels of…

Reviews the research literature on the abilities of infants to categorize visual information on dot patterns; schematic faces; hue; and orientation. (HOD)

The effect of the location, in picture or text, of spatial, contextual, and operational information on comprehension was evaluated. Results showed that textual presentation of spatial information produced fewer errors, pictorial presentation reduced performance times, and pictorial presentation of contextual information reduced assembly times and…

Right-hemispheric specialization for tactual processing was investigated in right-handed preschool children. Cross-modal transfer from touch to vision was assessed while children palpated shapes with hand while music was simultaneously played to ear. Left-hand advantage and lateralized nature of interference among older children supports…

Investigates cerebral asymmetries to study the perception of visually presented emotional and verbal material. Grade 1/2, Grade 4/5, and Grade 8 children reported on emotional facial expressions and on letters shown laterally and tachistoscopically. Findings indicate right hemisphere dominance for mediating visual emotional information from as…

Questions the conclusions described in PS 501 739. (MB)