Temporal association tracts and the breakdown of episodic memory in mild cognitive impairment
Journal article
Metzler-Baddeley, Claudia, Hunt, Sarah, Jones, Derek Kenton, Leemans, Alexander, Aggleton, John P. and O'Sullivan, Michael J.. (2012). Temporal association tracts and the breakdown of episodic memory in mild cognitive impairment. Neurology. 79(23), pp. 2233 - 2240. https://doi.org/10.1212/WNL.0b013e31827689e8
Authors | Metzler-Baddeley, Claudia, Hunt, Sarah, Jones, Derek Kenton, Leemans, Alexander, Aggleton, John P. and O'Sullivan, Michael J. |
---|---|
Abstract | Objective: To examine the pattern of association between microstructure of temporal lobe connections and the breakdown of episodic memory that is a core feature of mild cognitive impairment ( MCI ). Methods: Twenty-five individuals with MCI and 20 matched controls underwent diffusion MRI and cognitive assessment. Three temporal pathways were reconstructed by tractography: fornix, parahippocampal cingulum ( PHC ), and uncinate fasciculus. Tissue volume fraction—a tract-specific measure of atrophy—and microstructural measures were derived for each tract. To test specificity of associations, a comparison tract ( corticospinal tract ) and control cognitive domains were also examined. Results: In MCI, tissue volume fraction was reduced in the fornix. Axial and radial diffusivity were increased in uncinate and PHC implying more subtle microstructural change. In controls, tissue volume fraction in the fornix was the predominant correlate of free recall. In contrast, in MCI, the strongest relationship was with left PHC. Microstructure of uncinate and PHC also correlated with recognition memory, and recognition confidence, in MCI. Conclusions: Episodic memory in MCI is related to the structure of multiple temporal association pathways. These associations are not confined to the fornix, as they are in healthy young and older adults. In MCI, because of a compromised fornix, alternative pathways may contribute disproportionally to episodic memory performance. |
Year | 2012 |
Journal | Neurology |
Journal citation | 79 (23), pp. 2233 - 2240 |
Publisher | Lippincott Williams & Wilkins |
ISSN | 0028-3878 |
Digital Object Identifier (DOI) | https://doi.org/10.1212/WNL.0b013e31827689e8 |
Scopus EID | 2-s2.0-84871297083 |
Page range | 2233 - 2240 |
Publisher's version | File Access Level Controlled |
Place of publication | United States |
https://acuresearchbank.acu.edu.au/item/87x38/temporal-association-tracts-and-the-breakdown-of-episodic-memory-in-mild-cognitive-impairment
Restricted files
Publisher's version
103
total views0
total downloads0
views this month0
downloads this month