+ Supporting evidence from case studies
E - HM: The destruction of his hippocampus affected his ability to form new LTMs. After surgery, he could still form new procedural memories, but not episodic or semantic memories.
E - Shows there are different memory stores in LTM, as one can be damaged while the others are unaffected.
L - However, research from case studies is difficult to generalise from one case to other settings.