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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
Published on: August 11, 2019
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Hippocampal subfield associations with memory depend on stimulus modality and retrieval mode
Etienne Aumont1,2,3, Aurélie Bussy4,5, Marc-André Bedard1,2,3,6
1NeuroQAM Research Centre, Université du Québec à Montréal (UQAM), Montreal H2X 3P2, Canada.
Brain Communications
|November 30, 2023
Summary
Specific hippocampal subfields are linked to memory performance in older adults. The CA1 region supports verbal memory, while the dentate gyrus and cornu ammonis 4 (DG/CA4) are crucial for free recall across modalities.
Area of Science:
- Neuroscience
- Gerontology
- Cognitive Psychology
Background:
- Hippocampal atrophy is a known indicator of age-related memory decline.
- Different hippocampal subfields may play distinct roles in memory impairment.
Purpose of the Study:
- To investigate the relationship between hippocampal subfield volumes and memory performance in older adults without dementia.
- To explore the differential contributions of specific hippocampal subfields to verbal and visual memory recall and recognition.
Main Methods:
- Cross-sectional study of 97 older adults (aged >60) using MRI for hippocampal subfield segmentation.
- Memory assessment via verbal and visual free recall and recognition tasks.
- Positron emission tomography (PET) imaging to assess amyloid-β and tau positivity.
Main Results:
- Verbal memory (free recall and recognition) correlated positively with CA1 and strata radiatum, lacunosum, and moleculare volumes.
- Free recall (verbal and visual) correlated with right dentate gyrus and cornu ammonis 4 (DG/CA4) volume.
- Visual free recall, but not verbal, associated with right CA2/CA3 volume.
- Hippocampal tau positivity linked to reduced DG/CA4, CA2/CA3, and strata radiatum, lacunosum, and moleculare volumes; amyloid-β positivity was not.
Conclusions:
- Specific hippocampal subfields are differentially associated with memory functions in aging.
- CA1 is important for verbal memory, while DG/CA4 is crucial for free recall.
- Findings support roles for DG/CA4 in encoding distinctiveness and CA2/CA3 in visual memory recollection.
- Hippocampal subfield analysis aids in understanding early age-related memory changes and subfield roles.
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