Subjects can undertake cognitive tasks while the brain is scanned in real-time.
There is evidence for a 'storage system' rather than a partcular singular area for memory. Memory involves many different parts of the brain which have different roles in the storage and retrieval of memory - e.g. the frontal lobes and the thalamus. Damage to these areas can affect memory in different ways. In Korsakoff amnesics, the damage is usually limited to the thalamus. We do not know HOW exactly, memory works - how memories are stored, accessed and retrieved.