The definition of gelastic seizure does not indicate a certain anatomic localization.
Different patterns of dipole source localization in gelastic seizure with or without a sense of mirth.
Later, it turned out, that he was suffering from a rare form of epileptic episode called gelastic seizure
, reports the New York Daily News.
The couple first thought Riley was suffering from epilepsy, however they later found out he was suffering from three separate conditions - rare disease moyamoya, a brain tumour and gelastic seizures
, which cause giggling fits.
HHs usually lead to seizures in infancy, typically presenting with gelastic seizures
. These seizures are rarely accompanied by altered consciousness in infancy but may present with impairment of consciousness as the patient gets older.
Gelastic seizures are mainly attributed to hypothalamic hamartomas; however it is also reported that epileptogenic zone may be in the hypothalamus as well as in the temporal lobe.
Wehner et al., "Gelastic seizures: Incidence, clinical and EEG features in adult patients undergoing video-EEG telemetry," Epilepsia, vol.
"This tumour causes Finley to have endocrine problems, severe epilepsy, gelastic seizures
, darcrystic seizures, tonic-clonic seizures, developmental delays, rage attacks and learning difficulties."
 The term comes from the Greek word "gelos" (Laughter) to emphasize the main characteristic of these gelastic seizures. Gelastic seizures are epileptic events characterized by bouts of laughter.
Gelastic seizures have been related classically with Hypothalamic Hamartomas (HHs), although several descriptions have mentioned other locations.
Emotional behaviors which are observed and reported as seizures include embarrassment, sudden crying, (dacrystic seizures)[19,29,30] and explosive laughter (gelastic seizures
). These behaviors occur without the associated emotional feelings such as sadness or happiness.
Some children present with gelastic seizures
, some with neurosurgical problems and in others it is an incidental finding.