The effects on brain function can be reversed, the team wrote in the journal Occupational & Environmental Medicine, but this may take at least five years. Yet, little has been known about its potential impact on brain function. Researchers tested more than 3,000 current or retired workers in a variety of sectors in southern France in 1996, 2001 and 2006 for long- and short-term memory, processing speed and overall cognitive abilities.
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