
166 Coverbal Synchrony in Human-Machine Interaction
used by the speaker. It has been shown more recently that co-speech
gestures also participate in the conveying of semantic information, and
that they play a role in the organization of discourse by speakers. At
last, much like what happens in the verbal and vocal modalities, they
reveal something of the interpersonal relationship between participants
to an interaction. It would, however, be simplistic to suggest that
in any utterance, exactly the same information is conveyed in the
three modalities at the same time. It cannot be expected therefore
that when information is repeated by a participant ...