Memory lost and regained following bilateral hippocampal damage

Katharina Henke, Neal E A Kroll, Hamraz Behniea, David G Amaral, Michael B. Miller, Robert Rafal, Michael S. Gazzaniga

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


We present a longitudinal neuropsychological study (31 examinations over a period of 18 months) of patient DE DF demonstrated bilateral atrophy of the hippocampal formation and globus pallidus resulting from carbon monoxide poisoning. Eighteen months after the event, the volume of the hippocampal formation was reduced by 42% on the left side and 28% on the right. The patient initially presented with a severe global amnesia. Then, he showed a gradual, yet selective recovery of episodic memory function. Verbal free recall and spatial memory performance remained reduced, whereas immediate word recall and recognition memory, as well as picture learning and memory, improved to levels at the lower range of normal performance. Interestingly nonspatial associative learning was never much impaired and recovered completely by the end of testing. These data are taken as evidence that the human hippocampal formation does not equally support different forms of episodic memory.

Original languageEnglish (US)
Pages (from-to)682-697
Number of pages16
JournalJournal of Cognitive Neuroscience
Issue number6
StatePublished - 1999

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience


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