Visual organization processes in XXXX .

@entity1 @entity161
@entity1 with @entity161 are known to be impaired at organizing and exploring the visual environment. However, these impairments vary across studies, and the conditions determining whether @entity1 are impaired or not are unclear. We aim to clarify this question by distinguishing different types of visual organization processes. A total of 23 @entity1 and matched controls had to identify 2 identical figures embedded in a global structure made of connectors linking figures by pairs. The 2 targets belonged to either the same perceptual group (linked by a connector) or 2 different pairs (not linked by a connector). In a neutral condition, no connectors were presented. Top-down processes were explored by manipulating the proportion of targets linked or not by a connector in 3 experimental blocks. @entity1 needed the same processing time as controls to extract targets linked by a connector from the global structure. They could also focus on connectors when incited to do so. Impairments were observed for targets that were part of different pairs. Extracting such targets is effortful and time consuming, and both groups were slower in this condition than in the neutral condition. However, @entity1 were slowed less than controls. This paradoxical improvement illustrates the fact that @entity1 do not structure visual elements that are part of a global structure and not automatically bound together. Our results suggest this is due to impaired top-down processes.
