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Posterior compensatory network in cognitively intact elders with hippocampal atrophy

Posterior compensatory network in cognitively intact elders with hippocampal atrophy ABSTRACT Functional compensation in late life is poorly understood but may be vital to understanding long‐term cognitive trajectories. To study this we first established an empirically derived threshold to distinguish hippocampal atrophy in those with Mild Cognitive Impairment (MCI n = 34) from those with proficient cognition (PRO n = 22), using data from a population‐based cohort. Next, to identify compensatory networks we compared cortical activity patterns during a graded spatial working memory (SWM) task in only cognitively proficient individuals, either with (PROATR) or without hippocampal atrophy (PRONIL). Multivariate Partial Least Squares analyses revealed that these groups engaged spatially distinct SWM‐related networks. In those with hippocampal atrophy and under conditions of basic‐SWM demand, expression of a posterior compensatory network (PCN) comprised calcarine and posterior parietal cortex strongly correlated with superior SWM performance (r = −0.96). In these individuals, basic level SWM response times were faster and no less accurate than in those with no hippocampal atrophy. Cognitively proficient older individuals with hippocampal atrophy may, therefore, uniquely engage posterior brain areas when performing simple spatial working memory tasks. © 2014 Wiley Periodicals, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

Posterior compensatory network in cognitively intact elders with hippocampal atrophy

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References (69)

Publisher
Wiley
Copyright
© 2015 Wiley Periodicals, Inc.
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.22395
pmid
25475988
Publisher site
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Abstract

ABSTRACT Functional compensation in late life is poorly understood but may be vital to understanding long‐term cognitive trajectories. To study this we first established an empirically derived threshold to distinguish hippocampal atrophy in those with Mild Cognitive Impairment (MCI n = 34) from those with proficient cognition (PRO n = 22), using data from a population‐based cohort. Next, to identify compensatory networks we compared cortical activity patterns during a graded spatial working memory (SWM) task in only cognitively proficient individuals, either with (PROATR) or without hippocampal atrophy (PRONIL). Multivariate Partial Least Squares analyses revealed that these groups engaged spatially distinct SWM‐related networks. In those with hippocampal atrophy and under conditions of basic‐SWM demand, expression of a posterior compensatory network (PCN) comprised calcarine and posterior parietal cortex strongly correlated with superior SWM performance (r = −0.96). In these individuals, basic level SWM response times were faster and no less accurate than in those with no hippocampal atrophy. Cognitively proficient older individuals with hippocampal atrophy may, therefore, uniquely engage posterior brain areas when performing simple spatial working memory tasks. © 2014 Wiley Periodicals, Inc.

Journal

Hippocampus – Wiley

Published: May 1, 2015

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