This research was supported by a grant from the National Institute of Child Health and Human Development (RO1 HD 33470) and by grant M01-RR00533 from the General Clinical Research Center program of the National Center for Research Resources, National Institutes of Health to Boston University School of Medicine.
We thank Margaret Kjelgaard for providing the stimuli and design suggestions for Experiments 2 and 3. We express our sincere gratitude to the National Williams Syndrome Association and New England regional chapter for their help in recruiting participants; and to the families and individuals who participated in this study.