Is my brain in the minor key?

My favourite music is Tudor and Elizabethan church music. This was written before the idea of music having a key signature, but a lot of it has a minor feel. Also, whenever I try to indicate what a tune sounds like by singing it off the top of my head, my wife accuses me of singing it in the minor.

I was wondering, is it possible to have a brain that works in the minor key? What would be the implications?