For me its the opposite. One of the strongest triggers for me is reading aloud. When i was 10ish I did an impersonation of Hans and Frans from the old SNL bit. One of the people who saw it mentioned to my mother that I spoke much clearer when I was doing the impersonation. So now I pretty much do an impersonation of my grandfather's accent all of the time. I have no idea if this would work for anyone else, but it works for me.