Friday, April 29, 2011

Small areas of the brain go to sleep when we're up too late

Sleep deprivation is one of the most common forms of mental impairment, as it reduces performance in a variety of cognitive and motor tasks. A new paper has identified what might be the cause of this poor performance: small parts of a mammal's brain appear to go into a sleep-like state while they're otherwise apparently awake. And, in rats, the degree to which the brain is experiencing these tiny episodes of sleep correlates with their decline in performance on a simple task.

The study relies on differences in the resolution at which we measure neural activity. On a crude level, rats and humans show a similar pattern of neural activity when non-REM sleep is recorded with an EEG: rhythmic peaks of activity, in between which the brain goes largely silent, with the neurons effectively "offline," as the authors call it.

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Ashley Olsen Danneel Harris Veronika Vaeková Eve Brittany Lee

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