Greater cortical thinning in normal older adults predicts later cognitive impairment

Jennifer Pacheco, Joshua O. Goh, Michael A. Kraut, Luigi Ferrucci, Susan M. Resnick

Research output: Contribution to journalArticlepeer-review

Abstract

Cross-sectional studies have shown regional differences in cortical thickness between healthy older adults and patients with Alzheimer's disease (AD) or mild cognitive impairment (MCI). We now demonstrate that participants who subsequently develop cognitive impairment leading to a diagnosis of MCI or AD (. n= 25) experience greater cortical thinning in specific neuroanatomic regions compared with control participants who remained cognitively normal (. n= 96). Based on 8 years of annual magnetic resonance imaging scans beginning an average of 11 years before onset of cognitive impairment, participants who developed cognitive impairment subsequent to the scanning period had greater longitudinal cortical thinning in the temporal poles and left medial temporal lobe compared with controls. No significant regional cortical thickness differences were found at baseline between the 2 study groups indicating that we are capturing a critical time when brain changes occur before behavioral manifestations of impairment are detectable. Our findings suggest that early events of the pathway that leads to cognitive impairment may involve the temporal lobe and that this increased atrophy could be considered an early biomarker of neurodegeneration predictive of cognitive impairment years later.

Original languageEnglish (US)
Pages (from-to)903-908
Number of pages6
JournalNeurobiology of aging
Volume36
Issue number2
DOIs
StatePublished - Feb 1 2015

Keywords

  • Alzheimer's disease
  • Cortical thinning
  • Early detection
  • Longitudinal
  • Mild cognitive impairment

ASJC Scopus subject areas

  • Neuroscience(all)
  • Aging
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology

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