Biological Amnesia is

Thiamine deficiency, hypoglycemia, hypoxia (including carbon monoxide poisoning), and herpes simplex encephalitis all have a predilection to damage the temporal lobes, paicularly the hippocampi, and thus can be associated with the development of amnestic disorders. The below image show major causes of amnestic disorders. Reference: Kaplan and Sadock's synopsis of psychiatry, 11th edition, page 719.