When the scientists compare the brains of London taxi drivers with those of other drivers, they find the cabbies have more grey matter in the area of the brain associated with memory. They believe that this part of the brain, the mid-posterior hippocampus, is where black-cab drivers store a mental map of London, including up to 25,000 street names and the location of all the major tourist attractions.
The research is the first to show that the brains of adults can grow in response to specialist use.
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