Vargha-Khadem et al. (1997)

Differential Effects of Early Hippocampal Pathology on Episodic and Semantic Memory

Science, 277(5324), 376-380

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DOI

Abstract

Global anterograde amnesia is described in three patients with brain injuries that occurred in one case at birth, in another by age 4, and in the third at age 9. Magnetic resonance techniques revealed bilateral hippocampal pathology in all three cases. Remarkably, despite their pronounced amnesia for the episodes of everyday life, all three patients attended mainstream schools and attained levels of speech and language competence, literacy, and factual knowledge that are within the low average to average range. The findings provide support for the view that the episodic and semantic components of cognitive memory are partly dissociable, with only the episodic component being fully dependent on the hippocampus.

Reference

Vargha-Khadem, F., Gadian, D. G., Watkins, K. E., Connelly, A., Van Paesschen, W., & Mishkin, M. (1997). Differential Effects of Early Hippocampal Pathology on Episodic and Semantic Memory. Science, 277(5324), 376-380. https://doi.org/10.1126/science.277.5324.376

What Rests on This

2 mechanisms cite this source. Each finding below is quoted as it appears on that mechanism's own page.

Semantic Knowledge Memory Systems

Neural substrate

Three people with bilateral hippocampal damage from birth or early childhood had severe amnesia for everyday events yet attended mainstream schools and reached low-average to average levels of language, literacy and factual knowledge, suggesting semantic learning is not fully hippocampus-dependent

Episodic Memory Memory Systems

Neural substrate

Three patients with bilateral hippocampal damage from birth or early childhood had pronounced amnesia for everyday episodes yet reached low-average to average language, literacy, and factual knowledge, suggesting that only the episodic component depends fully on the hippocampus