What is Anhedonia?

In plain terms

Anhedonia is a reduced ability, or motivation to feel pleasure. The word was coined in 1896 by the French psychologist Théodule Ribot to describe a loss of the capacity to enjoy things. Clinicians now use it a little more broadly: in the DSM-5, anhedonia means either a diminished ability to experience pleasure or a markedly reduced interest in activities a person used to find rewarding.

Wanting vs. liking

Researchers no longer treat pleasure as a single thing. They separate "wanting", the motivation to pursue a reward and the anticipation of enjoying it, from "liking", the pleasure you actually feel once you have it. Anhedonia can affect either side: some people still enjoy something in the moment but lose the drive to seek it out, while others keep chasing rewards that no longer feel satisfying. A related difficulty is learning from rewards in the first place.

What causes it?

Anhedonia is thought to involve a breakdown somewhere in the brain's reward system, and in particular the neurotransmitter dopamine. Brain-imaging studies point to regions such as the prefrontal cortex, the striatum, and the amygdala — areas that help us anticipate, evaluate, and respond to rewarding experiences.

Where it shows up

Anhedonia is best known as a core symptom of major depression, where it affects roughly 70% of people. Someone can be diagnosed with depression on the basis of anhedonia even without a persistently low mood. It is also one of the "negative symptoms" of schizophrenia, and it appears in substance-use disorders (where it can predict relapse), Parkinson's disease, bipolar depression, and post-traumatic stress disorder. Research has also linked anhedonia to suicidal thoughts, seemingly independent of how severe a person's depression is overall.

Can it be treated?

Anhedonia has historically been one of the harder symptoms of depression to treat with standard antidepressants, and this is an active area of research rather than a settled question. Studies have explored approaches such as ketamine and non-invasive brain stimulation (for example, transcranial magnetic stimulation) that aim at the brain's reward circuitry.

And the game?

Anhedon.io is a quick for-fun game inspired by research on how reward-related behaviour can subtly shift when people are depressed. It is not a diagnosis, a screening, or a medical tool. If you're concerned about your own ability to feel pleasure or about your mood, please talk to a doctor or mental-health professional. In the U.S. you can call or text 988 (Suicide & Crisis Lifeline) any time. Back to the game.

This article was adapted from the Wikipedia article "Anhedonia", which is released under the Creative Commons Attribution-ShareAlike 4.0 License. The text has been edited and condensed, and this adaptation is likewise available under CC BY-SA 4.0.