Multisensory integration of stimuli occurring in the area surrounding our bodies gives rise to the functional representation of peripersonal space (PPS). PPS extent is flexible according to the affective context and the target of an action, but little is known about how social context modulates it. We used an audiotactile interaction task to investigate PPS of individuals during social interaction. Participants had to detect as fast as possible a tactile stimulus while task-irrelevant looming sounds were presented, while they were paired as collaborative dyads and as competitive dyads. We also measured PPS in participants seated near an inactive individual. PPS boundaries were modulated only when participants collaborated with a partner, in the form of an extension on the right hemispace and independently of the location of the partner. This suggests that space processing is modified during collaborative tasks. During collective actions, a supra-individual representation of the space of action could be at stake in order to adapt our individual motor control to an interaction as a group with the external world. Reassessing multisensory integration in the light of its potential social sensitivity might reveal that low-level mechanisms are modified by the need to interact with others.

译文

在我们身体周围区域发生的刺激的多感觉整合产生了个人周围空间 (PPS) 的功能表示。PPS范围根据情感环境和行为目标是灵活的,但对社会环境如何调节它知之甚少。我们使用了听觉互动任务来调查社交互动过程中个人的PPS。参与者必须尽可能快地检测到触觉刺激,同时呈现与任务无关的隐约可见的声音,同时将它们配对为协作二元组和竞争二元组。我们还测量了坐在不活跃个体附近的参与者的PPS。仅当参与者与合作伙伴合作时,才以右侧半球空间上的扩展形式且与合作伙伴的位置无关,才对PPS边界进行调整。这表明在协作任务期间修改了空间处理。在集体行动期间,可能会危及行动空间的超个人表示,以使我们的个人运动控制适应作为一个整体与外部世界的互动。根据其潜在的社会敏感性重新评估多感官整合可能会发现,与他人互动的需求会改变低级机制。

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