gelastic seizures
Pronunciation: jeh-LAS-tik
Seizures characterized by inappropriate laughter or giggling, often associated with hypothalamic hamartomas.
Full Definition
Gelastic seizures are a distinctive type of seizure characterized by sudden, inappropriate laughter or giggling without associated mirth or happiness. The term derives from the Greek word "gelos" meaning laughter. These seizures are most commonly associated with hypothalamic hamartomas in children but can occur with other lesions. The laughter is typically hollow, mechanical, and not accompanied by the facial expressions of genuine emotion. Gelastic seizures often progress to other seizure types and can be associated with precocious puberty and cognitive decline.
Usage
Usage note: Always use plural form; contrast with dacrystic (crying) seizures when relevant.
In Context
- "The child's gelastic seizures prompted MRI imaging that revealed a hypothalamic hamartoma." — Pediatric neurology report
- "Gelastic seizures preceded the development of complex partial seizures by several months." — Epilepsy monitoring unit summary