No one has come near to finding a genetic basis or a characteristic neurological abnormality for autism, and as a result there is no biological marker or brain scan used to diagnose ASD.
Although the so-called mental disorders undoubtedly have a biological correlate, their nature goes beyond the body involving social, cultural, and psychological dimensions. More often than not our suffering is the result of how we organize our affairs on a collective level
Because the “scientists” who study, categorise, and establish guidelines for autism can’t find anything definitive, they resort to scientism. Over time, it becomes part of our cultural “common sense.”
Sami Timimi discusses the lack of findings for a genetic or neurobiological basis for ADHD, and explores the short- and long-term effects of stimulant drugs.
Insane Medicine, Chapter 3: The Manufacture of Attention-Deficit/Hyperactivity Disorder (ADHD) (Part...
Both the idea that there are some characteristic brain-based abnormalities for those diagnosed with ADHD, and that the medications used have specific properties that target a disease process—like a chemical imbalance—are false.