The Rat Race Is Rough Ask Any Rat

If you think stress is making your brain old and befuddled before its time, you may be right. Researchers know that areas of the brain associated with learning memory can deteriorate with age. And neuroscientist Philip Landfield of the University of Kentucky wondered whether stress accelerated that change. Using mild electric shocks, he trained rats to move across a plastic runway when a buzzer sounded. Then he buzzed at random. Not knowing when to expect an alarm, the rats spent the whole time--four hours a day--in a tizzy.

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