Chauvigné Léa A S, Belyk Michel, Brown Steven
Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, ON, Canada.
PLoS One. 2018 Jan 11;13(1):e0191098. doi: 10.1371/journal.pone.0191098. eCollection 2018.
Many forms of joint action involve physical coupling between the participants, such as when moving a sofa together or dancing a tango. We report the results of a novel two-person functional MRI study in which trained couple dancers engaged in bimanual contact with an experimenter standing next to the bore of the magnet, and in which the two alternated between being the leader and the follower of joint improvised movements. Leading showed a general pattern of self-orientation, being associated with brain areas involved in motor planning, navigation, sequencing, action monitoring, and error correction. In contrast, following showed a far more sensory, externally-oriented pattern, revealing areas involved in somatosensation, proprioception, motion tracking, social cognition, and outcome monitoring. We also had participants perform a "mutual" condition in which the movement patterns were pre-learned and the roles were symmetric, thereby minimizing any tendency toward either leading or following. The mutual condition showed greater activity in brain areas involved in mentalizing and social reward than did leading or following. Finally, the analysis of improvisation revealed the dual importance of motor-planning and working-memory areas. We discuss these results in terms of theories of both joint action and improvisation.
许多形式的联合行动都涉及参与者之间的身体联结，比如一起搬沙发或跳探戈时。我们报告了一项新颖的两人功能性磁共振成像研究结果，在该研究中，训练有素的夫妻舞者与站在磁体孔旁的实验者进行双手接触，并且两人在联合即兴动作的领导者和跟随者角色之间交替。主导表现出一种自我导向的总体模式，与参与运动规划、导航、序列、动作监测和错误纠正的脑区相关。相比之下，跟随表现出一种更具感官性、外部导向的模式，揭示了涉及躯体感觉、本体感觉、运动跟踪、社会认知和结果监测的脑区。我们还让参与者进行了一种“相互”条件的实验，其中运动模式是预先学习的，角色是对称的，从而最大限度地减少了任何主导或跟随的倾向。与主导或跟随相比，相互条件在涉及心理奖励的脑区表现出更强的活动。最后，对即兴创作的分析揭示了运动规划和工作记忆区域的双重重要性。我们根据联合行动和即兴创作的理论来讨论这些结果。
