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PART | III Multimodal Human–Computer and Human-to-Human Interaction
to the realism and believability of the dialogue system, emotional
cues, turn-taking signals and prosodic cues such as punctuators and
emphasisers were given to the agent. The main rules for creating
the prosodic gestures were to use a combination of head movements
and eyebrow motion and maintain a high level of variation between
different utterances.
Lee et al. in [43] have created rules for generating nonver-
bal behaviour by extracting information from the lexical, syntactic
and semantic structure of the surface text. Behaviour includes head
movement, eyebrow movement, gaze/eye ...