Beta-amyloid moderates the relationship between cortical thickness and attentional control in middle- and older-aged adults

Nicole S. McKay, Aylin Dincer, Vidushri Mehrotra, Andrew J. Aschenbrenner, David Balota, Russ C. Hornbeck, Jason Hassenstab, John C. Morris, Tammie L.S. Benzinger, Brian A. Gordon

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Although often unmeasured in studies of cognition, many older adults possess Alzheimer disease (AD) pathologies such as beta-amyloid (Aβ) deposition, despite being asymptomatic. We were interested in examining whether the behavior-structure relationship observed in later life was altered by the presence of preclinical AD pathology. A total of 511 cognitively unimpaired adults completed magnetic resonance imaging and three attentional control tasks; a subset (n = 396) also underwent Aβ-positron emissions tomography. A vertex-wise model was conducted to spatially represent the relationship between cortical thickness and average attentional control accuracy, while moderation analysis examined whether Aβ deposition impacted this relationship. First, we found that reduced cortical thickness in temporal, medial- and lateral-parietal, and dorsolateral prefrontal cortex, predicted worse performance on the attention task composite. Subsequent moderation analyses observed that levels of Aβ significantly influence the relationship between cortical thickness and attentional control. Our results support the hypothesis that preclinical AD, as measured by Aβ deposition, is partially driving what would otherwise be considered general aging in a cognitively normal adult population.

Original languageEnglish
Pages (from-to)181-190
Number of pages10
JournalNeurobiology of Aging
Volume112
DOIs
StatePublished - Apr 2022

Keywords

  • Alzheimer disease
  • Amyloid
  • Attention
  • Cognition
  • Control
  • Free surfer
  • Moderation

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