# Evolving intentions for social interaction -from entrainment to joint action **Keywords:** joint action, intention, evolution of social interaction, tool use, communication, social cognitive neuroscience **Opening (not a real abstract):** Evolving intentions for social interaction: from entrainment to joint action Günther Knoblich* and Natalie Sebanz This article discusses four different scenarios to specify increasingly complex mechanisms that enable increasingly flexible social interactions. The key dimension on which these mechanisms differ is the extent to which organisms are able to process other organisms’ intentions and to keep them apart from their own. Drawing on findings from ecological psychology, scenario 1 focuses on entrainment and simultaneous affordance in ‘intentionally blind’ individuals. Scenario 2 discusses how an interface between perception and action allows observers to simulate intentional action in others. Scenario 3 is concerned with shared perceptions, arising through joint attention and the ability to