She found that taxi drivers' hippocampi do, indeed, become more unusual with time: their back parts grow and their front parts shrink.

ECONOMIST: Neuroscience: Taxicology | The

She looked for differences in all of the brain's main components, but the only ones she could find were in the hippocampi.

ECONOMIST: Neuroscience: Taxicology | The

Since London taxi drivers are navigators par excellence, Dr Maguire and her colleagues decided to examine their hippocampi to see if they differed from those of ordinary Londoners who do not necessarily know the best way to get to Bermondsey by way of Bethnal Green.

ECONOMIST: Neuroscience: Taxicology | The