Gee..never heard of that but the brain is an amazing organ.Having worked for a Neuropathologist for a while and having watched many Science Channel/PBS type documentaries on the brain I become more and more fascinated.
I saw a documentary once that focused on different cures for serious seizure disorders (epilepsy).One treatment (experimental,I think) was to sever the "corpus collosum" which connects the two hemispheres of the brain.In such patients you can,for example,put an easily identifiable object in their hand while they're blindfolded and they can't *tell* you (verbally) what it is they're holding but they can write it down.There were many other equally wierd things as well.I find stuff like that beyond amazing!
Years ago, I did some rehabilitative craft work with home-bound stroke victims. One of the clients was an elderly man with aphasia and left side paralysis. He was a fluent curser, while everything else he tried to say was gibberish.
It was explained to me that people who habitually used some words/phrases before the stroke retained those because the synapses were so well-reinforced.