Scanning their brains using functional magnetic resonance imaging, the scientists found that a region involved in language processing - the temporal lobe, part of the prefrontal cortex - was activated during verbal learning in rested patients.

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The prefrontal cortex is the most peculiarly enlarged part of the brain in human beings, but whereas the part near the top of the head generally seems to be involved in conventional intelligence, the "orbital" region tends to handle the processing of social information that is, assessing the moods and personalities of other people.

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The biggest differences in myelination occurred in the temporo-parietal region in the brain's left hemisphere the area that seems to control most language processing.

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Facilities with a processing capacity of 862, 200 barrels a day, or about 74% of the region's total, were operating at reduced rates, according to the department.

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