Autobiographical narratives relate to Alzheimer's disease biomarkers in older adults

Rachel F. Buckley*, Michael M. Saling, Muireann Irish, David Ames, Christopher C. Rowe, Victor L. Villemagne, Nicola T. Lautenschlager, Paul Maruff, S. Lance Macaulay, Ralph N. Martins, Cassandra Szoeke, Colin L. Masters, Stephanie R. Rainey-Smith, Alan Rembach, Greg Savage, Kathryn A. Ellis

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Background: Autobiographical memory (ABM), personal semantic memory (PSM), and autonoetic consciousness are affected in individuals with mild cognitive impairment (MCI) but their relationship with Alzheimer's disease (AD) biomarkers are unclear. Methods: Forty-five participants (healthy controls (HC) = 31, MCI = 14) completed the Episodic ABM Interview and a battery of memory tests. Thirty-one (HC = 22, MCI = 9) underwent β-amyloid positron emission tomography (PET) and magnetic resonance (MR) imaging. Fourteen participants (HC = 9, MCI = 5) underwent one imaging modality. Results: Unlike PSM, ABM differentiated between diagnostic categories but did not relate to AD biomarkers. Personal semantic memory was related to neocortical β-amyloid burden after adjusting for age and apolipoprotein E (APOE) É4. Autonoetic consciousness was not associated with AD biomarkers, and was not impaired in MCI. Conclusions: Autobiographical memory was impaired in MCI participants but was not related to neocortical amyloid burden, suggesting that personal memory systems are impacted by differing disease mechanisms, rather than being uniformly underpinned by β-amyloid. Episodic and semantic ABM impairment represent an important AD prodrome.

    Original languageEnglish
    Pages (from-to)1737-1746
    Number of pages10
    JournalInternational Psychogeriatrics
    Volume26
    Issue number10
    DOIs
    Publication statusPublished - 20 Jun 2014

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