CPS- Case study of Molaison and Wearing – both episodic memory was impaired due to brain damage, but semantic untouched, could still walk, know what a dog is, but count recall petting a dog – shows there’s different types of LTM.
CPW- Brain injury studies lack control variables, the injuries are usually unexpected, so the researcher has no way of telling what their memory was like before the minjury making it difficult to see how bad the damage was.