Personality traits associated with hallmarks of Alzheimer’s disease

New research from the Florida State University College of Medicine found that changes in the brain associated with Alzheimer's disease are often visible early on in individuals with personality traits associated with the condition.

The study focused on two traits previously linked to the risk of dementia: neuroticism, which measures a predisposition for negative emotions, and conscientiousness, which measures the tendency to be careful, organized, goal-directed and responsible.

We have done studies showing who's at risk of developing dementia, but those other studies were looking at the clinical diagnosis. Here, we are looking at the neuropathology; that is, the lesions in the brain that tell us about the underlying pathological change. This study shows that even before clinical dementia, personality predicts the accumulation of pathology associated with dementia."

Antonio Terracciano, Professor of Geriatrics, College of Medicine

The findings, published as an article-in-press online with Biological Psychiatry and also available through FSU's open access research repository, combine data from the Baltimore Longitudinal Study of Aging (BLSA) and previously published work in a meta-analysis that summarized 12 studies on personality and Alzheimer's neuropathology. The studies combined included more than 3,000 participants. Combining results across studies provides more robust estimates of the associations between personality and neuropathology than a single individual study can typically provide.

In both the BLSA and meta-analysis, the researchers found more amyloid and tau deposits (the proteins responsible for the plaques and tangles that characterize Alzheimer's disease) in participants who scored higher in neuroticism and lower in conscientiousness.

The team also found associations to be stronger in studies of cognitively normal people compared to studies that included people with cognitive problems.

The findings suggest that personality can help protect against Alzheimer's and other neurological diseases by delaying or preventing the emergence of neuropathology for those strong in conscientiousness and low in neuroticism.

"Such protection against neuropathology may derive from a lifetime difference in people's emotions and behaviors," Terracciano said. "For example, past research has shown that low neuroticism helps with managing stress and reduces the risk of common mental health disorders. Similarly, high conscientiousness is consistently related to healthy lifestyles, like physical activity. Over time, more adaptive personality traits can better support metabolic and immunological functions, and ultimately prevent or delay the neurodegeneration process."

The BLSA is a scientific study of human aging conducted by the National Institute on Aging (NIA), part of the National Institutes of Health (NIH), that began in 1958. Personality was measured using a five-factor personality test, the most common personality assessment tool. At the time of their enrollment in the BLSA neuroimaging sub-study, all participants were free of dementia or other severe medical conditions.

Advances in brain scan technology used to assess in vivo amyloid and tau neuropathology made it possible for researchers to complete this work.

"Until recently, researchers measured amyloid and tau in the brain through autopsy -; after people died," Terracciano said. "In recent years, advances in medical imaging have made it possible to assess neuropathology when people are still alive, even before they show any symptoms."

This research was supported by NIA Intramural Research Program and by the NIA/NIH award numbers R01AG068093 and R01AG053297. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Additional authors include FSU College of Medicine Professor Angelina Sutin, Assistant Professor Martina Luchetti and postdoctoral researcher Damaris Aschwanden. Other co-authors are from the NIA, Johns Hopkins University, Washington University School of Medicine and the University of Montpellier.

Source:
Journal reference:
  • Terracciano, A., et al. (2021) Personality associations with amyloid and tau: Results from the Baltimore Longitudinal Study of Aging and meta-analysis. Biological Psychiatry. doi.org/10.1016/j.biopsych.2021.08.021.

Comments

  1. J P J P United States says:

    Low neuroticism and high conscientiousness did nothing to save my mother.

  2. cathy bradley cathy bradley United States says:

    My mom walked 3 miles a day for years; when Lewy body dementia hit it was a slow and ugly death.

  3. Bun Poh Bun Poh United States says:

    Wow. Correlation is NOT causation. People who are neurotic and/or not conscientious likely are more predisposed to and possibly even experiencing brain issues that lead to dementia. Lots of people who lead healthy lifestyles get dementia. Telling people that they should just change their personalities to avoid dementia is mind-blowingly stupid.

  4. Anne Ober Anne Ober United States says:

    USA about 168000 with this. Essentially no good data.
    I heard UCLA had some nice but not public protocols.
    I guess we wait for a pill or vaccine or kindly tut tut tut.tisk yidk.
    Same net effect.
    Mom got. Aphasia early psych meds seemed part of it

  5. M. Justice M. Justice United States says:

    Well, this is just another waste of scarce research funding on psychosocial psychiatry in never-ending confabulation-fueled hypothesis generation.  This is another facet of the resilience theory of so-called mental disorders.  In reality, "neuroticism" and conscientiousness have primary endogenous causality...i.e. brain based.  If this cohort of psychiatry is firm in its convictions that that disturbances in brain function are caused by environmental factors (meaning everything but something biological) then why does the quest never end to prove these nonsensical psychosocial theories of brain function disorders. This kind of content should have no place in a biological "psychiatry" journal.  And btw, one of the tags is Mental Health - which is a metaphor that refers to non-medical psychosocial issues - which also has no place in a respectable medical journal.

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
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