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I'd be interested to learn more about the psychology behind this and why our minds work this way..

Physically stepping backwards increases cognitive function. http://psycnet.apa.org/psycinfo/2009-06873-006 (full PDF http://www.aromatiseren.nl/cms/Uploads/manuscript_psychscien... ) The hypothesis is that stepping back is associated with avoidance, and that makes the brain more aware.

There is a good book - "Your Brain at Work" by David Rock - explaining this (and many other things)