What two sources from neuroscience suggest that there are two separate systems involved in long-term memory?

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Brain scan technology such as fMRI and PET scans have shown that different areas of the brain are activated during the encoding and retrieval of different types of long-term memory. Studies of adults with brain damage, specifically in the case of H.M., have also suggested that there are separate systems involved in long-term memory.

What Two Sources from Neuroscience Suggest That There Are Two