Fig. 2

Electrographic and epileptic features in patients with SYNGAP1 pathogenic variants. a Example electroencephalogram containing occipital spikes from patient with pathogenic SYNGAP1 variant. b Example electroencephalogram containing polyspikes from patient with pathogenic SYNGAP1 variant. c Example electroencephalogram containing rhythmic delta waves from patient with pathogenic SYNGAP1 variant. d Example electroencephalogram containing seizure activity from patient with pathogenic SYNGAP1 variant. Patient’s seizure was characterized by behavioral arrest. e Quantification of interictal epileptiform activity in patients with SYNGAP1 pathogenic variants