Thirty-four children were enrolled in this study, 18 with CP and 16 with TD. Participants
with CP were recruited through the CP clinic at Shriners Hospital for Children in
Philadelphia, PA and through other local rehabilitation facilities. Participants with TD were
recruited from siblings of the participants with CP, children of people known to the
investigators, and from a local day care center. All procedures were approved by the IRB of
Temple University Hospital (for Shriners Hospital) and also the IRBs of additional data
collection sites as needed. Parental consent was obtained prior to participation. Assent of a
minor was obtained from any participant 7 years of age or older.