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Hippocampal head size associated with verbal memory performance in nondemented elderly
V H Hackert1, T den Heijer, M Oudkerk
1Department of Epidemiology and Biostatistics, Erasmus Medical Center, Rotterdam, The Netherlands.
Neuroimage
|November 5, 2002
Summary
The hippocampal head, not the body or tail, is selectively involved in verbal memory performance. Larger hippocampal head volumes correlate with better memory recall, especially delayed recall, in older adults.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Radiology
Background:
- The hippocampus is vital for memory consolidation.
- Functional segregation along the hippocampus's longitudinal axis remains poorly understood.
- The entorhinal cortex connects different hippocampal subregions to association cortices.
Purpose of the Study:
- To investigate the selective involvement of the hippocampal head, body, and tail in verbal memory performance.
- To explore functional segregation within the hippocampus based on its longitudinal axis.
Main Methods:
- 511 non-demented participants (aged 60-90) underwent 1.5-T MRI scans.
- Manual tracing was used to measure hippocampal volumes (head, body, tail).
- Verbal memory was assessed using a 15-word learning test (immediate and delayed recall).
- Multiple linear regression analyzed the association between hippocampal subregion volumes and memory performance, adjusting for covariates.
Main Results:
- Larger hippocampal head volumes were significantly associated with higher scores on the verbal memory test.
- This association was most pronounced for delayed recall.
- Specifically, increased left hippocampal head volume correlated with better delayed recall (0.41 words/SD), as did the right hippocampal head (0.33 words/SD).
Conclusions:
- The hippocampal head shows selective involvement in verbal memory functions.
- These findings support the concept of functional segregation along the hippocampus's longitudinal axis.
- This research contributes to understanding how specific hippocampal subregions contribute to memory processes in aging individuals.