The current overly broad definition of autism has launched an epidemic of false diagnoses that include conditions of uncertain similarities. Professionals diagnose by ticking off symptoms on a subjective checklist that has no clear relation to causality. This study firmly establishes that autism has a singular neurophysiological cause that is responsible for all 52 of its documented traits, redefines autism in terms of this unique cause, and provides an objective litmus test whereby you can know for certain if someone suspected of being autistic has been correctly diagnosed.