Dictionary of Biological Psychology
Hedonia means a state or condition of PLEASURE.
Anhedonia is therefore characterized by the absence of pleasure. Anhedonia is often listed as a symptom of DEPRESSION, and this is meant to describe the lack of responsiveness to normally pleasurable stimuli in depressed individuals. Although it is sometimes suggested that a DOPAMINE ANTAGONIST or depletion of dopamine could produce anhedonia, and blunt the pleasurable effects of stimuli such as food, there is also considerable evidence against this idea.
JOHN D.SALAMONE
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