CONCLUSIONS

We have discussed the example of Williams syndrome because it illustrates how analysis in terms of visuomotor modules is a necessary and helpful way to consider the development of visual information processing in the brain. The function of the visual system is to enable effective interaction with the environment. The perspective presented here sees the processes of visual development, both normal and abnormal, as built around this interaction, which combines aspects of what have been traditionally considered perception, cognition, and motor control. From this perspective, the main conclusions we have argued are:

1. The cortical systems underlying vision develop in two-way interaction with subcortical systems.