But wait! As we enter a new year, I’ve just seen a couple studies about the senior brain that suggest: "Not so fast!”
- While senior brains may initially take longer than younger brains to make quick decisions in some situations, it’s often because the older study subjects consciously decide to make good, accurate decisions. Their brains have decided that being right is more important than being fast.
- Those same senior brains that were purposely deliberating about decisions can be TRAINED to act faster, in effect damping down that tendency for accuracy. With training, those older brains essentially acquired the same speed as younger brains, without a significant corresponding drop in accuracy.
Study leaders used two different tests. In the first, subjects sitting at computer screens were asked to decide whether they saw a “small” number (31-50) of asterisks, or a “large” number (51-70).
Funny enough, the young brain is more reactive to negative reinforcement than the older one. When the young participants made a mistake and had to plan and execute a new strategy to get the right answer, various parts of their brains were recruited even before the next task began. However, when the older participants learned that they had made a mistake, these regions were only recruited at the beginning of the next trial, indicating that with age, we decide to make adjustments only when absolutely necessary. It is as though the older brain is more impervious to criticism and more confident than the young brain.Added Monchi:
We now have neurobiological evidence showing that with age comes wisdom and that as the brain gets older, it learns to better allocate its resources. Overall, our study shows that Aesop's fable about the tortoise and the hare was on the money: being able to run fast does not always win the race -- you have to know how to best use your abilities. This adage is a defining characteristic of aging.See "ScienceDaily" 8/25/11.