By definition, in autism the social deficits are characterized by lack of interest in spontaneously sharing feelings, different levels of communication deficits, difficulties in imaginative plays, restrictive repertoire of interests, non-functional routine fixations, as well as stereotypies and other motor alterations, such as flapping with hands, circular movements and others (Nikolov, Jonker, and Scahill 2006; Gadia, Tuchman, and Rotta 2004). While the criteria of the DSM-V (Diagnostic and Statistical Manual of Mental Disorders-Fifth Edition) are not yet published, we still have to use the "older version". According with the DSM-IV criteria, there are five clinical situations that could be encompassed by the term "PDD" (Pervasive Developmental Disorders) or "ASD" (Autism Spectrum Disorders) with the same meaning of PDD or autism (Association 2002). Although it will change in the near future, the five current clinical ASD diagnosis admitted by DSM-IV-TR (Gadia et al., 2004) are: a) Autistic Disorder; b) Asperger Disorder (AD); c) Rett Disorder; d) Childhood Disintegrative Disorder; e) PDD-NOS (Pervasive Developmental Disorder-Not Otherwise Specified).