GPS, London Cabbies, and Brain Swelling

Are GPS navigational devices damaging our sense of direction?

http://www.theweek.com/article/index/102501/The_last_word_This_is_your_brain_on_GPS

London cabbies must take a test called “The Knowledge” which requires them to memorize 25,000 streets and thousands of landmarks.  Here is a link to the Knowledge; http://www.the-knowledge.org.uk/main/

Apparently, the back part of the hippocampus in the brains of cabbies is enlarged compared with brains of the average person.    However, the front part of the hippocampus shrinks.

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