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Cognitive decline: 2 personality traits may influence risk – Medical News Today

April 21, 2022
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Cognitive decline: 2 personality traits may influence risk – Medical News Today
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New research suggests that certain personality traits are linked to a higher risk of cognitive decline. Ksenia Krondo/Stocksy
  • A new study showed that certain personality traits are associated with risk for cognitive decline in older adults.
  • The study found that high neuroticism and low conscientiousness are associated with a negative impact on cognitive health.
  • Increasing conscientiousness may be a potential strategy to promote healthy cognitive aging.

Personality traits are the consistent internal characteristics that can predict and explain who we are and why we do what we do in certain situations. They consist of the feelings, attitudes, habits, and behaviors that a person displays.

The “Big Five” are factors that represent personality. They include:

  • neuroticism — being anxious and worrisome
  • conscientiousness — being disciplined and organized
  • extraversion — being friendly and outgoing
  • agreeableness — being helpful and forgiving
  • openness — being curious and perceptive

Our personality traits can impact our physical and mental well-being through patterns of helpful or unhelpful thoughts and behaviors. Studies have shown that personality traits can affect our cognitive functioning as we age.

Dr. David A. Merrill, an adult and geriatric psychiatrist, explained to Medical News Today that persistent stress could lead to high cortisol levels. High cortisol levels cause more rapid brain shrinkage, associated with Alzheimer’s risk.

Dr. Merrill is also the director of the Pacific Neuroscience Institute’s Pacific Brain Health Center at Providence Saint John’s Health Center in Santa Monica, CA. He was not involved in the study.

Current literature suggests that people with high neuroticism and low conscientiousness may be at increased risk for mild cognitive impairment (MCI), dementia, or death. The links between extraversion and cognitive impairment in studies were less consistent.

People with MCI have symptoms of memory loss but they can still go about their lives as usual. Having MCI does not interfere with the performance of daily activities, unlike living with dementia. About 12-18% of people 60 years and older have MCI, with approximately 10% to 15% developing dementia each year.

Discerning the association of personality traits with cognitive health is crucial to understanding abnormal aging.

This led researchers from the University of Victoria, Northwestern University, University of Edinburgh, and Rush University to examine the relationship between personality traits and transition from no cognitive impairment (NCI) to MCI, dementia, or death in older adults.

They published their findings in the American Psychological Association Journal of Personality and Social Psychology.

Researchers used data from 1954 older adults enrolled in the Rush Memory and Aging Project. Participants received annual assessments until death.

Determination of cognitive status occurred in 3 stages. The first step measured the level of impairment based on results from a battery of 19 cognitive tests across 5 domains, including:

  • episodic memory: previous experiences with information on when, where, and what happened
  • semantic memory: meaningful and conceptual facts about the world
  • working memory: retention of a small amount of information to use in planning, reasoning, understanding, and problem-solving
  • perceptual speed: speed in comparing or finding figures or symbols or identifying patterns
  • visuospatial ability: identifying, processing, and interpreting visual information of objects in space

In the second step, a neuropsychologist conducted a blinded evaluation of the impairment rating and clinical data. Lastly, an experienced practitioner examined participants who met cognitive impairment criteria in person to confirm the assessment.

Researchers used a personality assessment called the NEO-Five Factor Inventory to score for conscientiousness, extraversion, and neuroticism. Higher scores indicated higher levels of these traits.

The study also adjusted for factors critical to the development of cognitive impairment.

Researchers used an analytic tool called multistate survival modeling to determine the effect of conscientiousness, extraversion, and neuroticism on transitioning through four stages (NCI, MCI, dementia, and death).

Participants with higher conscientiousness had a 22% decreased risk of progressing from NCI to MCI. Conversely, participants with higher neuroticism had a 12% increased risk of transitioning from NCI to MCI.

Participants with higher extraversion had a:

  • 12% increased probability of improving from MCI to NCI
  • 17% decreased likelihood of transitioning from dementia to MCI
  • 12% increased risk of progressing from dementia to death.

Dr. Tomiko Yoneda, study co-author, previous doctoral candidate at the University of Victoria and current postdoctoral researcher at Northwestern University, spoke to MNT about the study.

She said, “We found that individuals [high in conscientiousness and low in neuroticism] may live as long as other individuals but […] they will have more years without cognitive impairment.”

She explained that for an 80-year-old high in conscientiousness, this translated into a gain of 2 additional years without cognitive impairment.

Dr. Merrill added, “Positive goal-directed behaviors […] will help with your sense of self-discipline and allow you to essentially […] take better care of yourself. [C]onscientiousness [will] help you with these goal-directed behaviors.”

The study analyses did not account for personality changes, potentially limiting findings.

Dr. Yoneda explained, “Personality is relatively stable, but it is not set in stone, and previous research [documented] increases in neuroticism preceding, during, and following an MCI and dementia diagnosis.”

“Individuals can change their personality traits over time through concerted behavioral and thinking modifications (e.g., meditation, engagement in health behaviors).”

She added, “[Increasing] conscientiousness is one potential strategy for promoting healthy cognitive aging.”

Dr. Merrill agreed. “Taking part in psychotherapy is to take a step back from a stressor and try to look at things from a different perspective [to increase] your cognitive flexibility.”

“Increasing cognitive flexibility has been shown to correlate with better overall general health and may be an effective way to help protect your body from accelerated brain aging.”

– Dr. Merrill

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