This study will use magnetic resonance imaging (MRI) to investigate language function in children-that is, how language skills such as naming objects, understanding spoken language and reading are organized in the brain. The study focuses on children between 4 and 7 years old. Children 8 to 12 years old and adults will be studied before the younger children to test study paradigms appropriate for pre-literate children. The results of this study will help evaluate the usefulness of MRI in identifying language function and location and may improve the treatment of children with seizures.