1998;Stolcke, et al., 2000;Ji & Bilmes, 2006, inter alia) or to map them onto subsequences or "dialogue games" (Carlson 1983;Levin et al., 1998), from which participants' functional roles in conversation (though not social roles) may be extrapolated (e.g., Linell, 1990;Poesio and Mikheev, 1998;Field et al., 2008).
the effects of speech acts on social behaviors and roles of conversation participants have not been systematically studied.