I understand where you're coming from, however I think that remembering the past is not a very helpful criterium since memories correspond to physical changes in the brain. In the thought experiment, the 1:1 molecular clone would have the same memories and think that he had lived through the same things as the original human for what it's worth. I'm not yet convinced that it is possible to define one self even though our (physiological) human experience definitely makes us feel like we were this clearly defined, independent, conscious thing.
But of course the conditions you mention are also very interesting and make it non-trivial to define the "true" essence of the person. Another interesting one would be dementia.
But of course the conditions you mention are also very interesting and make it non-trivial to define the "true" essence of the person. Another interesting one would be dementia.