The rate of neurodevelopmental disabilities, including autism, mental retardation, hearing loss and attention deficit hyperactivity disorder is rising in the United States. Although estimates of the prevalence of these disorders vary, figures from the CDC indicate that 4% of all school age children are developmentally disabled. During infancy, many important milestones in behavioral development are shared between human and nonhuman primates. Learning more about the causes of abnormal development in monkeys has provided important insights into the mechanisms underlying neurodevelopmental...