If premise (a) of the memory argument — that knowledge loss requires forgetting — is false, the memory argument is unsound

It may be quite unintuitive to see memory in this way, and we shall attend to objections shortly. But it is worth noting that the view allows an externalist to resist the memory argument. A compatibilist might first grant that Oscar does not forget strictly speaking—after all, we can assume no neurological impairment has occurred in him. Yet she can add that Oscar loses some memory content regardless, thanks to the slow switch. Even though Oscar does not truly “forget,” he has still lost knowled