Inability to experience pleasure due to impairment or dysfunction of normal psychological and neurobiological mechanisms. it is a symptom of many psychotic disorders (e.g., depressive disorder, major; and schizophrenia).

Anhedonia is a diverse array of deficits in hedonic function, including reduced motivation or ability to experience pleasure. While earlier definitions emphasized the inability to experience pleasure, anhedonia is currently used by researchers to refer to reduced motivation, reduced anticipatory pleasure (wanting), reduced consummatory pleasure (liking), and deficits in reinforcement learning...