Global dot integration in typically developing children and in Williams syndrome.
Williams Syndrome (WS) is a neurodevelopmental disorder that results in deficits in visuospatial perception and cognition. The dorsal stream vulnerability hypothesis in WS predicts that visual motion processes are more susceptible to damage than visual form processes. We asked WS participants and typically developing children to detect the global structure Glass patterns, under "static" and "dynamic" conditions in order to evaluate this hypothesis. Sequentially presented Glass patterns are coined as dynamic because they induce illusory motion, which is modeled after the interaction between orientation (form) and direction (motion) mechanisms. If the dorsal stream vulnerability holds in WS participants, then they should process real and illusory motion atypically. However, results are consistent with the idea that form and motion integration mechanisms are functionally delayed or attenuated in WS. Form coherence thresholds for both static and dynamic Glass patterns in WS were similar to those of 4-5year old children, younger than what is predicted by mental age. Dynamic presentation of Glass patterns improved thresholds to the same degree as typical participants. Motion coherence thresholds in WS were similar to those of mental age matches. These data pose constraints on the dorsal vulnerability hypothesis, and refine our understanding of the relationship between form and motion processing in development.
['Palomares|Melanie|M|', 'Shannon|Matthew T|MT|']
D000293:Adolescent D000328:Adult D000367:Age Factors D002648:Child D002657:Child Development D002675:Child, Preschool D005556:Form Perception D006801:Humans D009039:Motion Perception D010364:Pattern Recognition, Visual D013028:Space Perception D014796:Visual Perception D018980:Williams Syndrome D055815:Young Adult
Development Williams Syndrome Motion processing Form processing Glass patterns Illusory motion Global integration