Dr. Phelps explains that cerebral palsy is an injury to the portion of the brain dealing with the control of muscles for the arms, legs, and speech and generally does not affect one's intelligence. Because the parts of the brain affected (cortex, cerebellum, and basal ganglia) do not regenerate, surrounding brain cells must be trained to carry out the missing functions. This is done through physical therapy. Dr. Phelps describes the activities of therapists at the Children's Rehabilitation Institute working with children on reciprocal exercise patterns and training them on the stabilizer, crutches, and parallel bars. Mr. Schwartz works with children on blowing exercises, speech and auditory therapy, and speech training using a mirror. Children demonstrate other exercises including grasping and releasing blocks, placing pegs in holes as part of a game, practicing dressing skills on a doll, and typing on an electric typewriter. Dr. Phelps offers hope to the afflicted, giving the example of Betty Lou Driver who learned how to walk at the Institute and now as an adult works there, helping other children.