Focal impaired awareness autonomic seizure Focal autonomic seizure with piloerection Focal impaired awareness autonomic seizure with piloerection 2020-03-16T08:06:29Z A Focal autonomic seizure with piloerection (bristling of hairs due to the involuntary contraction of small muscles at the base of hair follicles) characterized by impaired awareness at some point during the seizure.