In Focus:

Dim light may make us dumber

Spending too much time in dimly lit rooms and offices may actually change the brain's structure and hurt one's ability to remember and learn, indicates groundbreaking research by Michigan State University neuroscientists.

The researchers studied the brains of Nile grass rats (which, like humans, are diurnal and sleep at night) after exposing them to dim and  for four weeks. The rodents exposed to dim light lost about 30 percent of capacity in the , a critical brain region for learning and memory, and performed poorly on a spatial task they had trained on previously.

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