1. A method for simulating behavior of a live participant in a simulation supported by a simulator, the method comprising the steps of: monitoring the live participant for sound utterances as the live participant interacts with the simulation; building a virtual model of the live participant responsively to the monitoring; predicting a behavior of the live participant using the virtual model when triggered by a situational stimulus; comparing an observed actual behavior of the live participant in response to the situational stimulus with the predicted behavior; and adjusting the virtual model responsively to a difference between the predicted behavior and actual behavior that results from the comparing.