Differential Effects of Early Hippocampal Pathology on Episodic and Semantic Memory
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.
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Episodic memories depend on many brain regions for their creation and persistence.
“First, episodic memories depend on many brain regions for their creation and persistence.”
From Episodic Memory in AI Agents Poses Risks that Should be Studied and Mitigated (2025) · cites this paper as [68]
Damage to the hippocampus impairs the ability to store new episodic but not semantic memories.
“Damage to the hippocampus is known to impair the ability to store new episodic but not semantic memories [68].”
From Episodic Memory in AI Agents Poses Risks that Should be Studied and Mitigated (2025) · cites this paper as [68]
Forming representations of episodic memories critically depends on the hippocampus and nearby structures in the medial temporal lobe.
“Forming representations of episodic memories critically depends on the hippocampus.and nearby structures in the medial temporal lobe.”
From Episodic Memory in AI Agents Poses Risks that Should be Studied and Mitigated (2025) · cites this paper as [68]
In patients with hippocampal damage, semantic memory largely remains intact but severe deficits in episodic memory are observed.
“This separation is true of other amnesic patients, especially those resulting from hippocampal damage, whereby semantic memory largely remains intact but severe deficits in episodic memory are observed [6–9].”
From Is episodic-like memory <i>like</i> episodic memory? (2024) · cites this paper as [8]
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“Damage to the hippocampus is known to impair the ability to store new episodic but not semantic memories [68].”
- Authors
- Vargha-Khadem, F., Gadian, D. G., Watkins, K. E., Connelly, A., Van Paesschen, W., & Mishkin, M.
- Affiliations
- F. Vargha-Khadem and K. E. Watkins, Cognitive Neuroscience Unit, Institute of Child Health, University College London Medical School, Wolfson Centre, Mecklenburgh Square, London WC1N 2AP, UK.
- National Institutes of Health (US)
- Venue
- Science
- Published
- 1997-07-18
- Volume
- 277
- Issue
- 5324
- Pages
- 376-380
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2064864838
- Cited by
- 1,746
- References
- 22
- Citations by year
- 2026: 16 · 2025: 33 · 2024: 46 · 2023: 46 · 2022: 25 · 2021: 40 · 2020: 50 · 2019: 62 · 2018: 59 · 2017: 54 · 2016: 48 · 2015: 63 · 2014: 64 · 2013: 78 · 2012: 68
- FWCI
- 27.12
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Funders
- Wellcome Trust
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Functions and Memory
- Keywords
- hippocampal pathology, episodic memory, semantic memory, anterograde amnesia, memory dissociation, pediatric brain injury, acquired brain injury
- MeSH terms
- Adolescent, Adult, Amnesia, Brain Mapping, Cerebral Cortex, Child, Female, Hippocampus, Humans, Magnetic Resonance Imaging, Male, Memory, Neuropsychological Tests, Temporal Lobe
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