“…Speakers have been found to adapt their lexicon (Brennan, 1996;Pickering and Garrod, 2004;Nenkova et al, 2008), the grammatical and syntactic structure of their utterances (Levelt, 1982;Branigan et al, 2010;Cleland and Pickering, 2003;Haywood et al, 2005;Pickering and Ferreira, 2008), their pronunciation (Giles et al, 1991;Delvaux and Soquet, 2007;Babel and Bulatov, 2011;Aubanel and Nguyen, 2010;Bailly and Lelong, 2010;Pardo, 2006) and their prosodic characteristics to those of their partners (Natale, 1975;Gregory and Hoyt, 1982;Gregory et al, 1993;Stanford and Webster, 1996;Gregory and Dagan, 1997;Edlund et al, 2009;Levitan et al, 2011a;. They have been shown to display similar facial expressions (Bavelas et al, 1986;Hess and Blairy, 2001) and mimic gestures and body postures and movements (Condon and Sander, 1974;Meltzoff and Moore, 1977;Maurer and Tindall, 1983;Bernieri and Rosenthal, 1991;Chartrand and Bargh, 1999;Richardson et al, 2007;Shockley et al, 2007Shockley et al, , 2009).…”