Dötsch Dominik, Schubö Anna
Cognitive Neuroscience of Perception and Action, Faculty of Psychology, Philipps-Universität Marburg, Gutenbergstrasse 18, 35032, Marburg, Germany,
Exp Brain Res. 2015 Aug;233(8):2323-34. doi: 10.1007/s00221-015-4301-1. Epub 2015 May 12.
The present study investigated to what extent group membership affects an actor's representation of their partner's task in cooperative joint action. Participants performed a joint pick-and-place task in a naturalistic, breakfast-table-like paradigm which allowed the demonstration of varying degrees of cooperation. Participants transported a wooden cup from one end of a table to the other, with one actor moving it to an intermediate position from where their partner transported it to a goal position. Hand and finger movements were recorded via 3D motion tracking to assess actors' cooperative behavior. Before the joint action task was performed, participants were categorized as belonging to the same or to different groups, supposedly based on an assessment of their cognitive processing styles. Results showed that the orientation of the actors' fingers when picking up the cup was affected by its required angle at the goal position. When placing the cup at the intermediate position, most actors adapted the rotation of the cup's handle to the joint action goal, thereby facilitating the partner's subsequent movement. Male actors demonstrated such cooperative behavior only when performing the task together with an ingroup partner, while female actors demonstrated cooperative behavior irrespective of social categorization. These results suggest that actors tend to represent a partner's end-state comfort and integrate it into their own movement planning in cooperative joint action. However, social factors like group membership may modulate this tendency.
本研究调查了群体成员身份在多大程度上影响参与者在合作性联合行动中对其伙伴任务的表征。参与者在一个类似早餐桌的自然主义范式中执行一个联合拾取和放置任务，该范式能够展示不同程度的合作。参与者将一个木杯从桌子的一端移动到另一端，其中一个参与者将杯子移动到中间位置，然后其伙伴再将杯子从中间位置移动到目标位置。通过三维运动跟踪记录手部和手指的动作，以评估参与者的合作行为。在执行联合行动任务之前，参与者被归类为属于同一组或不同组，假定这是基于对他们认知加工方式的评估。结果表明，拿起杯子时参与者手指的方向受杯子在目标位置所需角度的影响。当将杯子放置在中间位置时，大多数参与者会根据联合行动目标调整杯子把手的旋转方向，从而便于伙伴后续的动作。男性参与者只有在与同组伙伴一起执行任务时才表现出这种合作行为，而女性参与者无论社会分类如何都会表现出合作行为。这些结果表明，在合作性联合行动中，参与者倾向于考虑伙伴最终状态的舒适度，并将其纳入自己的动作规划中。然而，像群体成员身份这样的社会因素可能会调节这种倾向。
