Psychology Department, Unité de Recherche en Sciences Cognitives et Affectives, Charles de Gaulle-Lille 3 University - University of Lille Nord de France Villeneuve d'Ascq, France.
Front Psychol. 2014 Dec 4;5:1407. doi: 10.3389/fpsyg.2014.01407. eCollection 2014.
Previous studies have shown that the spatio-temporal parameters of reach-to-grasp movement are influenced by the social context in which the motor action is performed. In particular, when interacting with a confederate, movements are slower, with longer initiation times and more ample trajectories, which has been interpreted as implicit communicative information emerging through voluntary movement to catch the partner's attention and optimize cooperation (Quesque et al., 2013). Because gaze is a crucial component of social interactions, the present study evaluated the role of a confederate's eye level on the social modulation of trajectory curvature. An actor and a partner facing each other took part in a cooperative task consisting, for one of them, of grasping and moving a wooden dowel under time constraints. Before this Main action, the actor performed a Preparatory action, which consisted of placing the wooden dowel on a central marking. The partner's eye level was unnoticeably varied using an adjustable seat that matched or was higher than the actor's seat. Our data confirmed the previous effects of social intention on motor responses. Furthermore, we observed an effect of the partner's eye level on the Preparatory action, leading the actors to exaggerate unconsciously the trajectory curvature in relation to their partner's eye level. No interaction was found between the actor's social intention and their partner's eye level. These results suggest that other bodies are implicitly taken into account when a reach-to-grasp movement is produced in a social context.
先前的研究表明，伸手抓握运动的时空参数受到运动动作执行的社会背景的影响。特别是，当与共谋者互动时，运动速度会变慢，启动时间更长，轨迹更大，这被解释为通过自愿运动产生的隐含交际信息，以引起合作伙伴的注意并优化合作（Quesque 等人，2013）。由于注视是社交互动的关键组成部分，本研究评估了共谋者的眼睛水平对轨迹曲率的社会调节作用。一个演员和一个面对对方的搭档参与了一个合作任务，其中一个人在时间限制内抓住并移动一根木钉。在这个主要动作之前，演员执行一个预备动作，即将木钉放在中央标记上。使用可调节的座椅，演员的座椅与演员的座椅相匹配或高于演员的座椅，从而不知不觉地改变了搭档的眼睛水平。我们的数据证实了先前社会意图对运动反应的影响。此外，我们观察到伙伴眼睛水平对预备动作的影响，导致演员无意识地夸大与伙伴眼睛水平相关的轨迹曲率。在演员的社会意图和他们的伙伴的眼睛水平之间没有发现相互作用。这些结果表明，在社交环境中进行伸手抓握运动时，其他身体会被隐含地考虑在内。
