Why Do We Lose Learning Ability?
March 24th 2010 00:10
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Study Examines Brain Changes During Puberty to Explain Loss of Learning Ability
By LAUREN COX
ABC News Medical Unit
Any mom who's struggled to ski as her children whizzed by on the bunny hill, or any dad who's had his kid figure out a new remote in 30 seconds flat can attest: adult brains don't learn as quickly as children's brains.
Dr. Sheila Wagner answers the question: 'Strategies For Adjusting To Puberty?'Last week researchers at the State University of New York (SUNY) figured out a small piece of the puzzle explaining why our learning ability declines. They also -- at least in mouse models -- pointed to a temporary antidote to the learning decline that starts in adolescence.
"Clearly there are major differences between mice and humans in terms of motivation and how we behave, but very simple processes still stay true," said Sheryl Smith, lead author on the paper explaining the findings published Friday in the journal Science. "We know that we all have the same kinds of brain chemicals."
"I hope people recognize that the teenage brain is quite different than a child's brain or an adult brain," she said.
For some reason, and Smith could only guess why, the presence of the GABA receptors in the teenage brain blocks a specific learning ability.
"It's special kind of learning," said Smith, who gave the example of learning how to spot openings in a moving basketball game, or memorizing a location of a shop when driving around town.
"But it could be something as simple as remembering where you put the keys when you set them down," said Smith. "For a mouse, it might be something as simple-minded as your parents teaching you how to remember to find the nest."
Smith tested the mice's learning ability by putting them on a round, movable surface which had a specific section designed to give an uncomfortable jolt should the mouse set foot there. She found the young mice easily learned where the jolt was coming from and how avoid it in one or two tries, but the mice going through puberty never learned how to avoid the jolt on the moving surface.
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Comment by signals
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But Dr. Margaret Blythe, chair of the American Academy of Pediatrics Committee on Adolescence, said human adolescent behavior is so complex that such a small aspect like GABA receptors and stress are unlikely to change behavior.
"I don't even know if I would draw the analogy -- their (human adolescents) social environment is much more complicated," said Blythe, who pointed out a range of hormones social stresses and even learning tasks are far more complicated with hamans than mice.
During adolescent we are trying to find ourselves and are more concerned about our place in the social hierarchy.
Comment by katyzzz
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That is the problem with research, but then someon, somehow, suddenly gets it altogether, but there is already a lot of research out there and no-one is acting on it.
We don't do our adolescents any favours, just turn them into unbearable people.