 Cerebral palsy CP is the most common childhood motor disability. The neurotransmitter dopamine DA is important in cognition and emotionsbehavior. DA may also be important in motor skill learning. Genes that relate to DA function may affect a person s ability to learn new cognitive or motor skills. Some children with CP can learn motor skills easily while others have trouble. Researchers want to find out if DA gene variations cause some of this variability. 