Kinematics fingerprints of leader and follower role-taking during cooperative joint actions

Sacheli, Lucia Maria; Tidoni, Emmanuele; Pavone, Enea Francesco; Aglioti, Salvatore Maria; Candidi, Matteo

Abstract

Performing online complementary motor adjustments is quintessential to joint actions since it allows interacting people to coordinate efficiently and achieve a common goal. We sought to determine whether, during dyadic interactions, signaling strategies and simulative processes are differentially implemented on the basis of the interactional role played by each partner. To this aim, we recorded the kinematics of the right hand of pairs of individuals who were asked to grasp as synchronously as possible a bottle-shaped object according to an imitative or complementary action schedule. Task requirements implied an asymmetric role assignment so that participants performed the task acting either as (1) Leader (i.e., receiving auditory information regarding the goal of the task with indications about where to grasp the object) or (2) Follower (i.e., receiving instructions to coordinate their movements with their partner’s by performing imitative or complementary actions). Results showed that, when acting as Leader, participants used signaling strategies to enhance the predictability of their movements. In particular, they selectively emphasized kinematic parameters and reduced movement variability to provide the partner with implicit cues regarding the action to be jointly performed. Thus, Leaders make their movements more “communicative” even when not explicitly instructed to do so. Moreover, only when acting in the role of Follower did participants tend to imitate the Leader, even in complementary actions where imitation is detrimental to joint performance. Our results show that mimicking and signaling are implemented in joint actions according to the interactional role of the agent, which in turn is reflected in the kinematics of each partner.

Citation

Sacheli, L. M., Tidoni, E., Pavone, E. F., Aglioti, S. M., & Candidi, M. (2013). Kinematics fingerprints of leader and follower role-taking during cooperative joint actions. Experimental Brain Research, 226(4), 473-486. https://doi.org/10.1007/s00221-013-3459-7

• Journal Article Type: Article
• Acceptance Date: Feb 15, 2013
• Online Publication Date: Mar 17, 2013
• Publication Date: 2013-05
• Deposit Date: Mar 23, 2019
• Journal: Experimental Brain Research
• Print ISSN: 0014-4819
• Electronic ISSN: 1432-1106
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 226
• Issue: 4
• Pages: 473-486
• DOI: https://doi.org/10.1007/s00221-013-3459-7
• Keywords: Joint action; Predictive simulation; Motor signaling; Visuo-motor interference; Grasping kinematics
• Public URL: https://hull-repository.worktribe.com/output/1419052
• Publisher URL: https://link.springer.com/article/10.1007%2Fs00221-013-3459-7