Repetitive and restrictive behavior are among the main symptoms of autism spectrum disorders (ASDs). However, the mechanisms behind repetitive behaviors in autism have proven quite challenging to understand. Although some experts suggest that these behaviors in children with ASD result from an attention deficit, others are convinced children with autism have abnormalities in the motor system. According to those groups of experts, behaviors and developmental disorders in people with autism are caused by motor deficits usually observed in autism spectrum disorders.