Abstract
Using artificial emotions helps in making human-robot interaction more personalised, natural, and so more
likeable. In the case of humanoid robots with constrained facial expression, the literature concentrates on the expression of
emotions by using other nonverbal interaction channels. When using multi-modal communication, indeed, it is important to
understand the effect of the combination of such non-verbal cues, while the majority of the works addressed only the role of
single channels in the human recognition performance. Here, we present an attempt to analyse the effect of the combination of
different animations expressing the same emotion or different ones. Results show that when an emotion is successfully expressed
using a single channel, the combination of this channel with other animations, that may have lower recognition rates, appears to
be less communicative.