Abstract
Communication is a focal point in studies of joint action, where collective cognitive activity required (Sebanz and Knoblich, 2006). In this study, a virtual experimental environment was utilized where participants’ communication was restricted to text messaging interface with a limited set of letters and symbols. In eight experimental sessions, similar but different joint action tasks were given; each couple improved their joint action skills and developed their own private communication systems. Analysis shows, in addition to several quantitative parameters, trends of diminishing use ratio of directive speech acts and increasing use ratio of assertive speech acts had been observed which are claimed to be characteristics of development of a mature and effective communication system and cognitive mechanisms of joint action.
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