What would it be like to lack, as H. M. does, the ability to form new explicit memories? If, as has been suggested, implicit memory systems preceded explicit systems in our evolutionary history, do...

What would it be like to lack, as H. M. does, the ability to form new explicit memories? If, as has been suggested, implicit memory systems preceded explicit systems in our evolutionary history, do you think our ancestors were capable of conscious awareness independent of memory?