Hey , I agree with most of what's been discussed by Lynn, Bruce, Chad and others that support mind development. I think the subject is fascinating and doens't need the adornment of urban myths.
I was made aware of this particular one while researching memetics and there's a whole 'nother game going on there.
In any case to me at least, the dojo is a place where I've had the chance to experience and observe the process of forming neural connections. One of the things I enjoy about Aikido lessons outside the martial aspect is this, the mind-body link.