Generalized-onset seizure generalized non-motor onset seizure true true An absence seizure is a Generalized Onset Non-Motor Seizure. An absence seizure causes a short period of blanking out or staring into space, and are usually so brief that they frequently escape notice. Like other kinds of seizures, they are caused by abnormal activity in a person’s brain. https://www.ncbi.nlm.nih.gov/pubmed/29327337 https://www.epilepsydiagnosis.org/seizure/generalized-seizure-groupoverview.html