This study examined the effect of a salient multimodal reinforcer on object search performance of 9 children with Down's syndrome (24-56 months old). Attentional deficits of children with mental retardation or at risk for delay influenced their performance. Contingency learning of children with Down's syndrome may be affected by the attentional…

Examined perception of object unity in partial occlusion in 72 infants. Recorded how long subjects looked at a display of complete and incomplete rods. In test and control conditions, infants looked longer at broken rods than at complete rods, suggesting that infants' cognitive, visual, or attentional skills may be insufficient to support…