retrograde amnesia (RA) is a loss of memory-access to events that occurred, or information that was learned, before an injury or the onset of a disease.
[1] It tends to negatively affect
episodic,
autobiographical, and
declarative memory while usually keeping
procedural memory intact with no difficulty for learning new knowledge. RA can be temporally graded or more permanent based on the severity of its cause and is usually consistent with
Ribot's Law: where subjects are more likely to lose memories closer to the traumatic incident than more remote memories.
[2] The type of information that is forgotten can be very specific, like a single event, or more general, resembling generic
amnesia. It is not to be confused with
anterograde amnesia, which deals with the inability to form new memories following the onset of an injury or disease.
This is what i think is going on here! you literally forget every minute after a severe head injury