Is PDA Autism? Rethinking Diagnostic Boundaries in the Neurodivergent Landscape
By PDA Insiders (Sally Cat and Brook Madera). With contributions from Kristy Forbes, Libby Hill, and Erica Evans. Illustrated by Sally Cat. Introduction Pathological Demand Avoidance (PDA) remains one of the most contentious and confusing neurodivergent profiles. At the heart of this debate is one persistent question: should PDA be recognised as a subtype of autism—or does it demand a category of its own? To understand this, we need to trace the evolution of diagnostic systems and how PDA people became diagnostic refugees. From PDD to the Autism Spectrum: The Collapse of Diagnostic Diversity Under the DSM-IV, conditions such as autistic disorder, Asperger's syndrome, and pervasive developmental disorder not otherwise specified (PDD-NOS) existed as separate but related diagnoses. PDA was first noted, and named by, Professor Elizabeth Newson who identified the profile in autistic children referred to her during the 1980s. She saw PDA as slotting under the PDD-NOS category—an intent...