GELASMUS By Nugent, Pam M.S. - May 11, 2013 the spasmodic laughter of people with certain psychogenic disorders and brain diseases. It is a psychomotor seizure and is called gelastic epilepsy. GELASMUS: "Gelasmus is uncontrolled laughter." Related Psychology Terms EPILEPSY SEIZURE NONEPILEPTIC SEIZURE (NES) EPILEPTIFORM SEIZURE BRAIN PATHOLOGY TORTICOLLIS ATONIC SEIZURE FOCAL MOTOR SEIZURE BRAIN PATHOLOGY CONVERSION NONEPILEPTIC SEIZURE Cite this page: Nugent, Pam M.S., "GELASMUS," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/gelasmus/ (accessed May 27, 2018).