Peterburs Jutta, Liepelt Roman, Voegler Rolf, Ocklenburg Sebastian, Straube Thomas
a Institute of Medical Psychology and Systems Neuroscience , University of Münster , Münster , Germany.
b Institute of Psychology , German Sport University Cologne , Cologne , Germany.
Soc Neurosci. 2019 Feb;14(1):114-124. doi: 10.1080/17470919.2017.1403374. Epub 2017 Nov 12.
This study used a joint flanker task to investigate differences in processing of social and non-social nogo cues, i.e., between cues indicating that a co-actor should respond and cues signaling that neither actor nor co-actor should respond, using event-related potentials (ERPs) and trial-to-trial response times (RTs). It was hypothesized that a social co-actor's response should be reflected in stronger modulation (slower RTs on subsequent trials; augmented neural responses) for social compared to non-social nogo. RTs and ERPs replicated flanker compatibility effects, with faster responses and increased P3a on compatible trials. In line with the hypotheses, ERPs revealed distinct coding of social and non-social nogo in the conflict-sensitive N2 which showed a compatibility effect only for social nogo, and in the attention/memory-related P3b which was larger for social relative to non-social nogo. The P3a did not distinguish between social and non-social nogo, but was larger for compatible and smaller for go trials. Contrary to our hypotheses, RTs were faster after social relative to non-social nogo. Hence, the representation of the co-actor's response in joint action modulates conflict processing reflected in the N2 and response discrimination and evaluation reflected in the P3b and may facilitate subsequent responses in the context of social versus non-social nogo.
本研究采用联合侧抑制任务，利用事件相关电位（ERP）和逐次试验反应时间（RT），来探究社会和非社会停止信号线索加工过程中的差异，即指示共同行动者应做出反应的线索与表明行动者和共同行动者都不应做出反应的线索之间的差异。研究假设，与非社会停止信号相比，社会共同行动者的反应应在社会停止信号的更强调制中得到体现（后续试验中反应时间更慢；神经反应增强）。反应时间和ERP重复了侧抑制兼容性效应，在兼容试验中反应更快且P3a增加。与假设一致，ERP显示在冲突敏感的N2中社会和非社会停止信号有不同编码，N2仅对社会停止信号表现出兼容性效应，而在与注意/记忆相关的P3b中，社会停止信号相对于非社会停止信号更大。P3a无法区分社会和非社会停止信号，但在兼容试验中更大，在执行试验中更小。与我们的假设相反，社会停止信号后的反应时间比非社会停止信号后的更快。因此，共同行动者在联合行动中的反应表征调节了N2中反映的冲突加工以及P3b中反映的反应辨别和评估，并且可能促进社会与非社会停止信号背景下的后续反应。
