When you battle the voices you are focused on the voices. You are paying tremendous attention to them. Victory to them.
When you disengage from them and let them simply warble along, and alone, they influence you far less. With time, they become all but background noise. Like road traffic and sounds of your own breathing. Victory to you.
It won't always work. But it's the most successful method of dealing with them I've found. I've no idea who the committee in my head is made up of, but many are clearly not my friend, and do not have my best interest at heart.
In reply to trigun7469:
recalling imagery helps me alot.
think back to a time or a task when you had absolutely no trouble focusing on the present and your work.
think about how you were feeling at the time, how it made you feel.
think about how your body felt, and what you were physically doing. posture, body language, were you loose or tight, were you hopped up or relaxed a bit.
try to remember all of those things from that time you're comparing to.
then, try your best to act like that time again.
Y'all are a bunch of berkeleyed-up nutcases! 
In reply to madmallard:
Well in my case, I'm focused on solving whatever problem lies at hand. Unfortunately, that doesn't transpose too well to performing music - learning and/or composing, yes. Performing, not so much... That's the time to already have my E36 M3 together, not be "figuring it out" on the fly - unless it's just a jam session.
