Diencephalic amnesia is impaired human memory associated with damage to diencephalic structures and their connections, including thalamic or mammillary pathways. It differs anatomically from damage confined to the hippocampus, although the relevant structures participate in connected systems. A comparative postmortem study linked anterior thalamic degeneration with amnesia in an alcohol-related clinical sample; associated pathology and case differences still limit assigning every deficit to one isolated structure. [ref]
Degeneration of anterior thalamic nuclei differentiates alcoholics with amnesia by A. Harding and others. 2000, comparative postmortem study
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