Apathy vs Anhedonia vs Affect Blunting

Overview

All three can make a person look, from the outside, as though they simply don't care or don't feel much any more, which is why they are so often confused with one another. The distinction lies in what exactly has been lost: motivation and interest (apathy), the capacity for pleasure (anhedonia), or the outward expression of emotion (affect blunting) — and a person can have any one of these without the other two.

Dimension	apathy	anhedonia	affect-blunting
What is lost	Interest, motivation, and drive to engage with things that would previously have mattered	The capacity to feel pleasure or satisfaction, specifically from activities that were previously rewarding	The outward range and intensity of emotional expression — face, voice, and gesture
Inner experience	A subjective lack of caring or drive — indifference to outcomes, including significant ones	The person may still want to do things, or make themselves do things, but finds the expected enjoyment simply doesn't arrive	Inner emotional life may or may not be as reduced as the outward display suggests — this is precisely what makes it hard to judge from appearance alone
Outward appearance	Disengaged, unmotivated, indifferent to circumstances that would ordinarily provoke a reaction	Can appear normal on the surface, since anhedonia is about the felt quality of an experience rather than a visible behavioural withdrawal	A flat face, monotone voice, and reduced gesture, regardless of the person's actual inner state
Effect on engagement with activities	The person doesn't initiate or pursue activities in the first place, from lack of drive	The person may still engage in an activity, but the anticipated enjoyment or reward fails to materialise once they do	Engagement with activities is not directly affected; what changes is how much emotion is visibly expressed while engaging
Typical example	A person no longer bothers to contact friends or pursue hobbies they once valued, showing no particular distress about the change, simply indifference	A person still goes to a favourite restaurant with friends but finds, to their own puzzlement, that the meal brings none of the enjoyment it once did	A person describes a recent bereavement in a flat, unchanging voice with a still face, even though they report feeling deeply affected inside

Common confusion

Because all three can present as a person who 'seems flat' or 'doesn't seem to care,' students often use the terms interchangeably, especially in describing negative symptoms of psychotic or depressive illness. In practice all three can co-occur in the same patient, but they don't have to, and distinguishing them matters: affect blunting is specifically about the visible display of emotion and can mislead an observer about how much a person actually feels, while apathy and anhedonia are both about something genuinely missing in the person's inner drive or capacity for reward, just at different points in the process.

Clarifying questions

Is it more that you can't be bothered to do things any more, or that you do them but they don't feel rewarding the way they used to?
When something happens that would normally upset or excite you, do you actually feel less about it inside, or do you feel it but it just doesn't show on your face or in your voice?
Have you noticed yourself avoiding starting things, or is it more that you try things but they don't give you what they used to?

Provenance

Class B · tier T1 · lifecycle migrated_candidate

Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 6, 'Disorders of Emotion'.