Anterograde and retrograde amnesia in a person with bilateral fornix lesions following removal of a colloid cyst

Amir Poreh, Gordon Winocur, Morris Moscovitch, Matti Backon, Elinor Goshen, Zvi Ram, Zeev Feldman

Research output: Contribution to journalArticlepeer-review

Abstract

AD, a 45-year-old man, presented with a severe and global anterograde amnesia following surgery for removal of a colloid cyst. Structural neuroimaging confirmed bilateral lesions to the fornix and a small lesion in the basal forebrain. Testing for remote episodic memory of autobiographical events, and for remote semantic memory of personal and public events, and of famous people, revealed that AD had a severe retrograde amnesia for autobiographical episodes that covered his entire lifetime, and a time-limited retrograde amnesia for semantic memory. Because the fornix and basal forebrain lesions disrupted major afferent and efferent pathways of the hippocampus, it was concluded that the integrity of the hippocampus and its projections are needed to retain and/or recover autobiographical memories no matter how old they are. By contrast, hippocampal contribution to semantic memory is time-limited. These findings were interpreted as consistent with Multiple Trace Theory, which holds that the hippocampal system is essential for recovering contextually rich memories no matter how old they are, but is not needed for recovering semantic memories.

Original languageEnglish
Pages (from-to)2241-2248
Number of pages8
JournalNeuropsychologia
Volume44
Issue number12
DOIs
StatePublished - 2006
Externally publishedYes

Keywords

  • Anterograde amnesia
  • Episodic (autobiographical) memory
  • Hippocampus
  • Medial temporal lobes
  • Semantic memory

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