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How Task Interactivity Shapes Action Observation.
Cerebral Cortex ( IF 3.7 ) Pub Date : 2019-12-17 , DOI: 10.1093/cercor/bhz205
L M Sacheli 1, 2 , C Verga 1 , E Arcangeli 1 , G Banfi 2, 3 , M Tettamanti 4 , E Paulesu 1, 2
Affiliation  

Action observation triggers imitation, a powerful mechanism permitting interpersonal coordination. Coordination, however, also occurs when the partners' actions are nonimitative and physically incongruent. One influential theory postulates that this is achieved via top-down modulation of imitation exerted by prefrontal regions. Here, we rather argue that coordination depends on sharing a goal with the interacting partner: this shapes action observation, overriding involuntary imitation, through the predictive activity of the left ventral premotor cortex (lvPMc). During functional magnetic resonance imaging (fMRI), participants played music in turn with a virtual partner in interactive and noninteractive conditions requiring 50% of imitative/nonimitative responses. In a full-factorial design, both perceptual features and low-level motor requirements were kept constant throughout the experiment. Behaviorally, the interactive context minimized visuomotor interference due to the involuntary imitation of physically incongruent movements. This was paralleled by modulation of neural activity in the lvPMc, which was specifically recruited during the interactive task independently of the imitative/nonimitative nature of the social exchange. This lvPMc activity reflected the predictive decoding of the partner's actions, as revealed by multivariate pattern analysis. This demonstrates that, during interactions, we process our partners' behavior to prospectively infer their contribution to the shared goal achievement, generating motor predictions for cooperation beyond low-level imitation.

中文翻译:

任务交互如何塑造行动观察。

观察行动会触发模仿,这是一种强大的机制,可以进行人际协调。但是,当合作伙伴的行为是非模仿性的并且在身体上不一致时,也会发生协调。一种有影响力的理论认为,这是通过自上而下调制前额叶区域施加的模仿来实现的。在这里,我们宁可认为协调取决于与交互伙伴共享目标:这通过左腹前运动皮层(lvPMc)的预测活动来塑造动作观察,超越非自愿模仿。在功能磁共振成像(fMRI)期间,参与者在需要50%模仿/非模仿反应的互动和非互动条件下,与虚拟伙伴依次播放音乐。在全析因设计中,在整个实验过程中,感知功能和低级电机要求均保持恒定。从行为上讲,由于非自愿地模仿身体上不协调的运动,互动环境使视觉运动干扰最小化。与此并行的是,lvPMc中神经活动的调节,这是在交互任务期间专门募集的,与社交交流的模仿/非模仿性质无关。lvPMc活动反映了伙伴行为的预测解码,如多元模式分析所揭示。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。从行为上讲,由于非自愿地模仿身体上不协调的运动,互动环境使视觉运动干扰最小化。与此并行的是,lvPMc中神经活动的调节,这是在交互任务期间专门招募的,与社交交流的模仿/非模仿性质无关。lvPMc活动反映了伙伴行为的预测解码,如多元模式分析所揭示。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。从行为上讲,由于非自愿地模仿身体上不协调的运动,互动环境使视觉运动干扰最小化。与此并行的是,lvPMc中神经活动的调节,这是在交互任务期间专门招募的,与社交交流的模仿/非模仿性质无关。lvPMc活动反映了伙伴行为的预测解码,如多元模式分析所揭示。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。与此并行的是,lvPMc中神经活动的调节,这是在交互任务期间专门募集的,与社交交流的模仿/非模仿性质无关。lvPMc活动反映了伙伴行为的预测解码,如多元模式分析所揭示。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。与此并行的是,lvPMc中神经活动的调节,这是在交互任务期间专门招募的,与社交交流的模仿/非模仿性质无关。lvPMc活动反映了伙伴行为的预测解码,如多元模式分析所揭示。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。正如多元模式分析所揭示的那样。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。正如多元模式分析所揭示的那样。这表明,在交互过程中,我们处理合作伙伴的行为以前瞻性地推断出他们对实现共同目标的贡献,并为低水平模仿之外的合作产生了运动预测。
更新日期:2019-12-19
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