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A histology teacher once told us about the effects of lobotomies on patients. That after the partial destruction of the frontal lobe connections, the patient had a lack of perception of subtle humor and sarcasm.
An associative series. Almost every joke is based on references that arise in the course of brain activity, thanks to the neurons responsible for this department.
Apparently, there is no separate humor center in the brain. There are a number of sequential processes involved in the perception of jokes:
Discovering a potential joke, understanding it, and evaluating it as funny/unfunny/repetitive requires a collaborative mindset and memory. This is usually accompanied by activation of the prefrontal and temporal cortex.
The signal to activate the emotional centers that trigger the laughter response itself, if the joke seemed funny, probably comes from the area of the left upper frontal gyrus. At least, it is described that artificial stimulation of this area leads to the fact that everything seems ridiculous in general (sci-hub.org)
Actually, the activation of emotional centers and the appearance of positive emotions. Usually, when a person is happy, feels pleasure, is in a state of euphoria, etc., first of all, the activity of the tonsils and the nucleus accumbens is observed.
Motor reactions (smile, laugh, etc.).