Character behavior in a video game is driven by a character's attributes. The character's attributes are classified as static attributes, dynamic attributes, meta attributes, and emotional attributes. A user issues external stimuli, such as voice commands, to a group of characters. One or more attributes associated with each character are adjusted based upon the external stimuli. Thus, the user may issue external stimuli to affect the behavior and actions of a group of characters. <IMAGE>
Group behavioural modification using external stimuli