
208 Coverbal Synchrony in Human-Machine Interaction
because it does not seem to have an obvious communicative function,
but it may also be a signal of the agent being bored or having nothing
to say, in which case it carries communicative meaning. Annotations
thus differ depending on whether the gestures are interpreted as
being intentionally communicative by the communicator (displayed or
signaled) (Allwood, 2001), or the gestures are judged (by the annotator)
to have a noticeable effect on the recipient.
Since emerging technology allows recognition of gestures and
faces via cameras and sensors, it is possible to extract gestures and
face expressions ...