Children with Williams syndrome and autism spectrum disorder have known deficits in their visual processing. Identifying typical patterns of development provides a key starting point for understanding such deficits. By using computer generated images and object manipulation, the project will measure aspects of visual attention and memory in infants. This will enable researchers to examine the role of motor development in infants' representation of the surface properties of objects and to investigate the role of developing memory and attention skills on the features infants represent. The broad goal is to deepen the understanding of how infants become able to form increasingly sophisticated object representations across the first year of life, and therefore provide a foundation for the understanding of atypical patterns of development.