After 25 years of investigation, researchers at Northwestern University in the United States have found out why some adults have acclimatized to near-optimal cognitive functioning since the 1980s.
Referred to as “super agers,” these individuals are over 80 years old, yet their memory capabilities rival those of adults in their 50s and 60s.
Since the year 2000, scientists have examined 290 of these super agers, assessing 77 brains to better understand those who resist cognitive decline.
The study revealed shared personality traits among the ultra-elderly compared to the general population. These individuals often report being highly social and possessing strong interpersonal connections.
However, the differences in personality are merely the tip of the iceberg. Dr. Sandra Weintraub – a Professor of Psychiatry, Behavioral Science, and Neurology at Northwestern and co-author of a new paper summarizes the findings regarding these super agers – “What we observed in their brains was astonishing; it felt like earth-shattering news for us.”
In some super agers’ brains, scientists identified amyloid and tau proteins, commonly known as plaque and tangles, which are significant in the context of Alzheimer’s disease. In other super agers, these were absent.
Nonetheless, no brains exhibited the damage typically linked with these plaques or tangles.
“Our observation is that there are two distinct mechanisms enabling someone to become a super ager,” Weintraub stated. “The first is resistance, meaning they do not develop plaque or tangles. The second is resilience; they do form these but do not experience negative brain impacts.”
In addition to that, these super agers exhibited youthful brain structures. While older brains generally have thinner cortices compared to younger ones, these individuals did not show such thinning.
In particular, they displayed remarkable thickness in the anterior cingulate cortex, a crucial area involved in processing information related to decision-making, emotions, and motivations.
Moreover, super agers had a greater number of Von Economo neurons, also known as spindle cells, compared to their normally aging peers. These neurons, located in the cortex, play a significant role in social behavior, emotional processing, and self-awareness.
“Our research indicates that exceptional memory in later years is achievable and correlates with a well-defined neurobiological profile,” Weintraub stated. “This paves the way for novel interventions aimed at preserving brain health in older age.”
Researchers expressed hope that their work would encourage cognitive health and unveil new approaches to slow or prevent future neurodegenerative diseases like dementia.
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Source: www.sciencefocus.com
