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Face-to-face interaction is multimodal and continuous. The functional communicative information exchanged during these interactions can be studied by observing the effects of some language primitives built on vocal micro-expressions with a gradual prosody which is supposed to create a ‘‘socio-affective glue’’ as a strong hypothesis of the work. The processes leading to this relationship building between interactants are studied through spontaneous interactions in a reduced micro-ecological context dealing with socio-isolated elderly who communicates with a personalizable smart home’s butler robot emitting the chosen language primitives as interaction medium.