BBC News - Brain changes seen in cabbies who take "The Knowledge" - 1 views
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Ryan Catalani on 09 Dec 11"They scanned a total of 79 trainees, just before they started to learn the "All-London" Knowledge [memorizing "25,000 streets and 20,000 landmarks and places of interest"], which can take between two and four years to complete. ... those who had attempted the Knowledge had increased the size of the posterior hippocampus - the rear section of the hippocampus which lies at the front of the brain. ... this advantage appeared to come at a price, as the non-cabbies outperformed them in other memory tasks, such as recalling complex visual information." The full study: http://www.pnas.org/content/97/8/4398.full.pdf+html