gelastic seizure
Pronunciation: jeh-LAS-tik
A rare type of seizure characterized by inappropriate laughter or giggling, often associated with hypothalamic hamartomas.
Full Definition
Gelastic seizures present as episodes of unmotivated laughter or giggling that are typically not associated with mirth or happiness. They are most commonly seen with hypothalamic hamartomas but can occur with other epileptogenic lesions. The laughter is usually hollow, mechanical, or mirthless and may be accompanied by other autonomic signs. These seizures often begin in early childhood and may be associated with precocious puberty when caused by hypothalamic lesions. Recognition is important as they may be mistaken for behavioral issues.
Usage
Usage note: From Greek 'gelos' meaning laughter. Contrast with dacrystic (crying) seizures.
In Context
- "The child's gelastic seizures were associated with a hypothalamic hamartoma on MRI." — Neuroimaging correlation
- "Gelastic seizures were initially misinterpreted as attention-seeking behavior." — Case history review