A sense of humor can be thought of in two ways: as the response to humorous stimuli (humor appreciation) or the ability to create humor (coping humor/humor production).
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
Understanding Freezing Injury in Plants
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Freezing injury and chilling injury are both types of low-temperature
damage that affect plants and agricultural produce, but freezing injury
specifically ...