Autism is widely believed to be a heterogeneous disorder; diagnosis is currently based solely on clinical criteria, although genetic, as well as environmental, influences are thought to be prominent factors in the etiology of most forms of autism. Our goal is to determine whether a predictive model based on single-nucleotide polymorphisms (SNPs)…

Tourette Syndrome, a condition characterized by involuntary muscular and verbal tics, is defined, its course described, incidence noted (possibly 1.6 percent of the population), etiology considered (from viewpoints of psychogenic and organic theories), treatment (primarily pharmaceutical therapy) discussed, and educational approaches examined.…