“…On the other hand, some vocal tract shapes are similar between speakers for some emotional states or modes of production, so that vocal tract resonances can participate, among other cues, in the perception, from the sound of the voice only, of smiling (Tartter, 1990), of different emotions (Siegwart andScherer, 1995, Burkhardt andSendlmeier, 2000) or of vocal effort (Liénard and Di Benedetto, 1999;Eriksson and Traunmuller, 2002).…”