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In dyadic leader\u2013follower interactions, leaders master the ability to carve their motor behaviour in order to \u2018signal\u2019 their future actions and internal plans while these signals influence the behaviour of follower partners, who automatically tend to imitate the leader even in complementary interactions. Despite their usefulness, signalling and imitation have a biomechanical cost, and it is unclear how this cost\u2013benefits trade-off is managed during repetitive dyadic interactions that present learnable regularities. We studied signalling and imitation dynamics (indexed by movement kinematics) in pairs of leaders and followers during a repetitive, rule-based, joint action. Trial-by-trial Bayesian model comparison was used to evaluate the relation between signalling, imitation and pair performance. The different models incorporate different hypotheses concerning the factors (past interactions versus online movements) influencing the leader's signalling (or follower's imitation) kinematics. This approach showed that (i) leaders' signalling strategy improves future couple performance, (ii) leaders used the history of past interactions to shape their signalling, (iii) followers' imitative behaviour is more strongly affected by the online movement of the leader. This study elucidates the ways online sensorimotor communication help individuals align their task representations and ultimately improves joint action performance.<\/jats:p>","DOI":"10.1098\/rsif.2015.0644","type":"journal-article","created":{"date-parts":[[2015,9,4]],"date-time":"2015-09-04T04:56:03Z","timestamp":1441342563000},"page":"20150644","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":81,"title":["Interactional leader\u2013follower sensorimotor communication strategies during repetitive joint actions"],"prefix":"10.1098","volume":"12","author":[{"given":"Matteo","family":"Candidi","sequence":"first","affiliation":[{"name":"Department of Psychology, Sapienza University, via dei Marsi 78, 00185 Rome, Italy"},{"name":"IRCCS, Fondazione Santa Lucia, via Ardeatina 306, 00100 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arianna","family":"Curioni","sequence":"additional","affiliation":[{"name":"Department of Psychology, Sapienza University, via dei Marsi 78, 00185 Rome, Italy"},{"name":"IRCCS, Fondazione Santa Lucia, via Ardeatina 306, 00100 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Donnarumma","sequence":"additional","affiliation":[{"name":"Institute of Cognitive Sciences and Technologies, National Research Council, Via S. 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