<unk>  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,<unk>  is currently used by researchers to refer to reduced motivation, reduced anticipatory pleasure (wanting), reduced consummatory pleasure (liking), and deficits in reinforcement learning. In the DSM-5,<unk>  is a component of depressive disorders, substance-related disorders, psychotic disorders, and personality disorders, where it is defined by either a reduced ability to experience pleasure, or a diminished interest in engaging in pleasurable activities. While the ICD-10 does not explicitly mention<unk> , the depressive symptom analogous to<unk>  as described in the DSM-5 is a loss of interest or pleasure.
Anhedonia
Sexual anhedonia
Musical anhedonia
Snatiation
Compulsive behavior
Automatism 
Alexithymia
Amnesia