21. The method of claim 19, wherein said step of using said bio-signal comprises re-providing said utterance for retraining when said bio-signal is below an upper threshold.
19. A method for training a speech recognition system to recognize a user's utterance, comprising the steps of: providing an utterance to the speech recognition system while in a training mode; monitoring a bio-signal derived from the user, said bio-signal being related to autonomic activity; and using said bio-signal to identify said utterance for retraining.