Interictal epileptiform activity (HP_0011182, a Human Phenotype Ontology id) can be described as follows. Epileptiform activity refers to distinctive EEG waves or complexes distinguished from background activity found in in a proportion of human subjects with epilepsy, but which can also be found in subjects without seizures. Interictal epileptiform activity refers to such activity that occurs in the absence of a clinical or subclinical seizure. Also known as: Epileptiform EEG discharges.