Strength - case study Evidence HM
point: clinical case studies like HM supports the LTM theory in regards to episodic and semantic memory being separate systems
evidence: the case study of HM showed that his episodic memory was impaired severely due to brain damage as he could not recall events from his past, however his semantic memory was intact as he still understood the meaning of words like knowing what a dog is.
explanation: this supports tulving 1970 LTM theory as it clearly shows that LTM does have two seperate systems