The cases of HM and Clive Wearing show how one type of LTM may be impaired (episodic in their cases), but the other types of LTM will be unaffected (i.e. procedural and semantic). For example,
Clive Wearing was still able to skillfully play the piano and understand the concept of music
(procedural and semantic) but was unable to remember his wife visiting him 5 minutes previously
(episodic). This gives strong support to the idea that different areas of the brain are involved in the
different types of LTM, and confirms the classification of different types of LTM as separate.