"The Dimensional vs Categorical Nature of Autistic Spectrum Disorder: Theorethical Considerations and A Systematic Review of Taxometric Analyses"

The thesis takes a theoretical approach to one of the timeliest empirical controversies in Psychopathology, reviewing the question of whether Autism Spectrum Disorder (ASD) ought to be understood categorically or dimensionally through an analysis of every taxometric study yet published on ASD. Throughout history, ASD has always been conceptualized in two main ways, that is using the categorical approach which recognizes individuals either with or without ASD and the dimensional perspective which views autism spectrum traits on a continuum. These views are evaluated critically in this thesis through an examination of taxometric analyses and statistical techniques that differentiate categorical and dimensional constructs. Questioning whether ASD should be considered a spectrum of traits which present in different ways, or as a distinct condition. This shift is then debated as to its relevance for diagnosis, treatment, and research, indicating that an approach to the deeper understanding of the neurodevelopmental condition could enable more of a synthesis between categorical and dimensional approaches.