This brain area is part of the supplementary motor area. Also, A.K. did NOT have the type of epilepsy with gelastic seizures. Each time her brain was stimulated, A.K. laughed and said that something was funny. The thing that she said caused her to laugh was different each time. A.K. laughed first, then made up a story that was funny to her.
Most people first know what is funny, then they laugh.
The authors of the paper believe that the area of the brain that caused laughter in A.K. is part of a larger circuit involving several different brain areas. So, now we know a little more about what part of the brain is responsible for humor. This does not explain why we laugh or why we don't laugh when we tickle ourselves. Believe it or not, there has been some research into this area. Some scientists believe that laughing caused by tickling is a built-in reflex since even babies do it.