Phenomenology -- Symptom Dimensions in OCD: Developmental and Evolutionary Perspectives -- Dimensional and Subtype Models of OCD -- Animal Models of Obsessive-Compulsive Behavior: A Neurobiological and Ethological Perspective -- Behavioral and Functional Animal Models of OCD -- The Case for the OCD Spectrum -- Obsessive-Compulsive Disorder: Essential Phenomenology and Overlap with other Anxiety…