年轻患者出现痴笑发作。
原来是这样的：这位飞行员是在经历一种罕见的被称为发作性痴笑的癫痫发作，没有其他症状。
As it turned out, the pilot, who showed no other symptoms, was experiencing a rare form of epileptic episode called gelastic seizure.
发作性痴笑的主要症状就是控制不住地大笑。
The main symptom of a gelastic seizure is uncontrolled laughter.
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