This thesis contains the results of three different lines of investigation. The first aim of this thesis is to provide more information about children with Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS), from a behavioral, as well as from a cognitive perspective. The second aim is to get a better understanding of what is considered as formal thought disorder (FTD) and how this plays a role in children with social contact problems. The final aim of this thesis comes from a biological point of view. We investigated the role of finger length ratios in children with Pervasive Developmental Disorders (PDDs) and other psychiatric disorders. Although there is some overlap among the different study samples, the aims and methods will be described for each of the three topics separately.

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F. Verheij (Fop)
Erasmus University Rotterdam
Erasmus MC: University Medical Center Rotterdam

de Bruin, E. (2007, January 24). The Chaotic Mind: A study of children with thought disorders and social contact problems. Retrieved from