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Weighed Down By Wisdom: Older Brains Are Slow But Not Why You Think

Weighed Down By Wisdom: Older Brains Are Slow But Not Why You Think

Last week, while waiting for the tank to fill at the gas station, I saw something that made my heart ache a little. In the spot behind mine, an elderly gentleman was trying to purchase gas, but was obviously perplexed by the digital pump and all its questions about discount cards, etc.

He kept looking back and forth between the pump and his car, lips slowly moving as he read the prompts silently to himself. Part of me wanted to rush over and say, “Here, let me help you with that!” but I didn’t. I didn’t want to insinuate that he wasn’t capable of pumping his own gas. While I drove away, I couldn’t help but feel sad. Old age will come for all of us, and some day it will very likely be me, moving slowly through some task that takes a teenager mere seconds. I was momentarily depressed at the prospect, but something I read a few days later changed my perspective.

A study spearheaded by Dr. Michael Ramscar of the University of Tuebingen found that the slow-down we see in older brains isn’t because of some kind of cognitive decay–like a car rusting in a junk yard–but rather the weight of decades of life experience. The research claims that scientists have assumed cognitive decline is the result of the brain shutting down in advanced year, but that may actually be due to faulty cognitive measures.

During the study, computers programmed as though they were humans were tasked with reading a certain amount each day and learning new things along the way. “When the researchers let a computer ‘read’ only so much, its performance on cognitive tests resembled that of a young adult. But if the same computer was exposed to the experiences we might encounter over a lifetime—with reading simulated over decades—its performance now looked like that of an older adult,” explains Ramscar in a press release. “Often it was slower, but not because its processing capacity had declined. Rather, just as it takes longer to find a missing sock as a drawer gets bigger, increased ‘experience’ had caused the computer’s database to grow, giving it more data to process—and that processing takes time.”

Essentially, it took the computers longer to search for a certain word or fact the bigger their databases became, a fairly intuitive fact that has important implications for our understanding of age-related slowdowns and decline.

Better healthcare and a shift away from manual labor careers means the planet is home to more elderly people than ever before, and it’s completely possible that younger generations will live even longer (climate change and environmental pollution notwithstanding). Ramscar and his fellow Tuebingen researchers hope that their discovery will change beliefs the cause of declining cognitive abilities, which often mean that older adults are seen as a burden on society.

Commenting on these findings in an editorial in the Journal Topics in Cognitive Science, editors Wayne Gray and Thomas Hills suggest, “It is time we rethink what we mean by the aging mind before our false assumptions result in decisions and policies that marginalize the old or waste precious public resources to remediate problems that do not exist.”

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136 comments

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7:49AM PST on Feb 1, 2014

Just an aside for those who believe ...

Pope Francis' prayer intention for February 2014: That the church and society may respect the wisdom and experience of older people.

I invite you to add your energy to the mix. There is real power in community. Thanks.

2:51PM PST on Jan 31, 2014

An interesting article but like others posting here, I do think the study needs questioning. Slowing down of cognitive function is mainly linked to cellular degeneration in the brain - the axons, the glial cells deterioration, the atrophy and shrinkage of the brain's structure.

11:29AM PST on Jan 31, 2014

Great comments everyone - thanks

12:18AM PST on Jan 31, 2014

FYI

Jim F. - elderly means old, of a certain age - aging
It has absolutely NOTHING to do with a persons mental capacity, only their age

5:58PM PST on Jan 30, 2014

Wish we could buy more memory and increase our processing speed.

4:25PM PST on Jan 30, 2014

Interesting

7:14AM PST on Jan 30, 2014

Works for me ... when that does not appear to be the case and slippage can no longer be denied, one knows quickly. In the meantime, if this holds true, the work force is missing the bet of experience over a required certificate or specific title yet to be tested. Many seniors looking to work are being wasted into dormancy, sad.


5:16PM PST on Jan 29, 2014

Interesting study.

1:52PM PST on Jan 29, 2014

There may well be validity to Dr. Michael Ramscar's study. However, it is also a fact that the human body slows down in the production of, or absorption of, many necessary nutrients as it ages. Addressing this lack of production or absorption by supplementation has been proven to restore the body to the level of action of a much younger body and greatly improve the life of the individual, including brain function. This would make it appear that the research has already been done.

1:40PM PST on Jan 29, 2014

I cannot address the problems of the elderly but I am puzzled by the "science" behind these conclusions. Dr. Ramscar devised a new theory and then programmed a computer to perform according to his theory. Of course it would do so! He then proclaimed his theory was proven and that it was the explanation for certain human behavior.

Something seems fishy here. I still accept the earlier theory of cognitive decline.

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