Facial mirth response is defined as the spontaneous response to humorous stimuli. Depressed patients frequently volunteer the information that they have lost their sense of humor.
The problem does not seem to be loss of the ability to perceive the point of the joke or even when instructed, to construct joke.
In moderate level the patient may see the point of a joke and can even force to smile, but he is usually not amused. He cannot see the light side of events and tends to take everything seriously.
Moderate loss of mirth response
