
that it believes but at the same time refuses the speaker’s message. In
order to display an appropriate backchannel signal according to the
agent’s communicative functions, a lexicon has been defined. Such
a lexicon has been created through the perceptual studies described
earlier in this paper (see Section 3). The LIP module can also generate
backchannels of mimicry of some user’s non-verbal behaviors, such
as head shake, nod and tilt, smile, raise of the eyebrows.
The authors are interested in this type of signals since several
studies have shown that mimicry, when not exaggerated to the point
of mocking, has several positive influences on ...