Did HM Have Retrograde Amnesia?

Did HM Have Retrograde Amnesia? Did HM have retrograde amnesia? For starters, H.M suffered from retrograde amnesia for the 11-year period prior to his surgery. Retrograde describes amnesia where you can’t recall memories that were formed before the event that caused the amnesia. Did HM have retrograde or anterograde? As well as severe anterograde amnesia,