Figure 1.

Building blocks of face-to-face interaction. Here we give examples of some interactive processes which cannot be fully studied in solitary individuals; this is not an exhaustive list but summarizes the processes examined in this special issue. For these processes to work, there are particular physical requirements in terms of shared spaces and the use of particular effectors; there are also particular cognitive requirements—processes that have been studied individually but which make a particular contribution or may be engaged differently in interaction.