Study on the hierarchical processing of biomotion in individuals with Williams Syndrome

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Biological motion (BM) is a visual phenomenon whereby our visual system can extract rich visual information from only point-light motion. It has been pointed out that the BM perception is part of a social perception and many recent behavioral studies have demonstrated that children with autism spectrum disorders are not good at detecting a human form from point-light motion. Although some studies in individuals with Williams syndrome (WS) on the BM perception have clarified the perceptual characteristics, it has not been well addressed the various aspects of BM processing. In the current study, we measured the thresholds for lower- and higher- levels of BM processing by adopting a psychophysical method and we found cognitive gaps in the BM perception.