Differentiating between AS and other ASDs relies on the judgment of experienced clinicians.[9] There is much overlap between AS and NLD: both have symptoms of precocious reading, verbosity, and clumsiness, but they differ in that children with AS have restricted interests, repetitive behaviors, and less-typical social interactions.[13] Tourette syndrome (TS) should also be considered in differential diagnosis: "It is in nonretarded, rigid individuals on the autistic spectrum, especially those with so-called Asperger syndrome, that differences with less severely affected individuals with TS and obsessive compulsive disorder may become blurred, or that both disorders may coexist."[14] Other problems to be considered in the differential diagnosis include selective mutism, stereotypic movement disorder and bipolar disorder[10] as well as traumatic brain injury or birth trauma, conduct disorder, Cornelia De Lange syndrome, fetal alcohol syndrome, fragile X syndrome, dyslexia, Fahr syndrome, hyperlexia, leukodystrophy, multiple sclerosis and Triple X syndrome.[15]