The ESSENCE of Autism and Other Neurodevelopmental Conditions: Rethinkin: Rethinking Co-Morbidities, Assessment, and InterventionESSENCE (Early Symptomatic Syndromes Eliciting Neurodevelopmental Clinical Examinations) refers to the group of neurodevelopmental disorders including autism, ADHD and tic disorders as well as conditions gaining increasing awareness such as ARFID, PANS and PANDAS. Professor of child psychiatry Christopher Gillberg describes the lifetime prognosis of ESSENCE, examining the common co occurrence between these conditions and the symptoms they present.