Dopamine Alone May Not Explain Anhedonia

Rethinking the Psychology of Losing Pleasure

Anhedonia—the reduced ability to experience pleasure, interest or motivation—is one of the most important symptoms associated with depression and several other psychiatric and neurological conditions.

For years, dopamine and the brain's reward system have occupied a central position in explanations of anhedonia. However, a new European expert report involving researchers from institutions including Amsterdam UMC, the University of Oxford, Charité Berlin and Maastricht University argues that the phenomenon is considerably more complex.

The report emerged from a meeting organised by the European College of Neuropsychopharmacology (ECNP) and the GALENOS project. Researchers reviewed evidence suggesting that medications increasing dopaminergic activity produce relatively small improvements in anhedonia.

This does not mean dopamine is irrelevant. Instead, the researchers argue that anhedonia may involve several partially distinct psychological processes.

One distinction is between “wanting” and “liking.” A person may have difficulty anticipating a rewarding experience, lack motivation to pursue it, or fail to experience pleasure once the experience occurs. These processes are related but not identical.

This perspective fits the transdiagnostic approach in contemporary psychology. Rather than treating anhedonia simply as a symptom belonging to depression, researchers increasingly view it as a psychological dimension that can appear across depression, schizophrenia, bipolar disorder, Parkinson's disease and other conditions.

The report also connects the issue to precision psychiatry. Instead of asking whether a treatment works for “anhedonia” as one broad category, researchers argue that future studies should determine which specific reward-related mechanism is impaired, in which patients, and through which biological pathway.

The theoretical shift is significant. It moves psychology away from single-cause explanations and toward multilevel models, in which subjective experience, behaviour, cognition and neurobiology are studied together.

In this framework, anhedonia is not necessarily one disorder or one biological deficit. It may represent several different psychological processes that produce a similar subjective experience: the feeling that things no longer feel rewarding.