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Mirroring multiple agents: motor resonance during action observation is modulated by the number of agents

Emiel Cracco (UGent) , Lize De Coster (UGent) , Micheal Andres and Marcel Brass (UGent)
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Abstract
Although social situations regularly involve multiple persons acting together, research on the mirror neuron system has focused on situations in which a single agent is observed. Therefore, the goal of the current study was to explore the role of the mirror mechanism in situations involving multiple agents. Specifically, we used transcranial magnetic stimulation (TMS) to investigate whether mirror activation is modulated by the number of observed agents. Based on group contagion research, we hypothesized that multiple agents would provide a stronger trigger to the motor system and would therefore produce a stronger mirror response than a single agent. Participants observed movements performed by a single hand or by two hands while TMS was applied to the primary motor cortex. The results confirmed that activation in the motor system was stronger for two hands. This suggests that input to the motor system increases as the number of agents grows. Relating back to group contagion, our study suggests that groups may be more contagious simply because their actions resonate louder. Given that the mirror mechanism has been linked to a variety of social skills, our findings additionally have important implications for the understanding of social interaction at the group level.
Keywords
MAGNETIC STIMULATION, PREMOTOR CORTEX, AUTOMATIC IMITATION, ACTION RECOGNITION, ACTION SIMULATION, SOCIAL COGNITION, SYSTEM, INHIBITION, FACILITATION, PERCEPTION, TMS, action, observation, imtation, mirror neuron

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Chicago
Cracco, Emiel, Lize De Coster, Micheal Andres, and Marcel Brass. 2016. “Mirroring Multiple Agents: Motor Resonance During Action Observation Is Modulated by the Number of Agents.” Social Cognitive and Affective Neuroscience 11 (9): 1422–1427.
APA
Cracco, E., De Coster, L., Andres, M., & Brass, M. (2016). Mirroring multiple agents: motor resonance during action observation is modulated by the number of agents. SOCIAL COGNITIVE AND AFFECTIVE NEUROSCIENCE, 11(9), 1422–1427.
Vancouver
1.
Cracco E, De Coster L, Andres M, Brass M. Mirroring multiple agents: motor resonance during action observation is modulated by the number of agents. SOCIAL COGNITIVE AND AFFECTIVE NEUROSCIENCE. 2016;11(9):1422–7.
MLA
Cracco, Emiel, Lize De Coster, Micheal Andres, et al. “Mirroring Multiple Agents: Motor Resonance During Action Observation Is Modulated by the Number of Agents.” SOCIAL COGNITIVE AND AFFECTIVE NEUROSCIENCE 11.9 (2016): 1422–1427. Print.
@article{7223639,
  abstract     = {Although social situations regularly involve multiple persons acting together, research on the mirror neuron system has focused on situations in which a single agent is observed. Therefore, the goal of the current study was to explore the role of the mirror mechanism in situations involving multiple agents. Specifically, we used transcranial magnetic stimulation (TMS) to investigate whether mirror activation is modulated by the number of observed agents. Based on group contagion research, we hypothesized that multiple agents would provide a stronger trigger to the motor system and would therefore produce a stronger mirror response than a single agent. Participants observed movements performed by a single hand or by two hands while TMS was applied to the primary motor cortex. The results confirmed that activation in the motor system was stronger for two hands. This suggests that input to the motor system increases as the number of agents grows. Relating back to group contagion, our study suggests that groups may be more contagious simply because their actions resonate louder. Given that the mirror mechanism has been linked to a variety of social skills, our findings additionally have important implications for the understanding of social interaction at the group level.},
  author       = {Cracco, Emiel and De Coster, Lize and Andres, Micheal  and Brass, Marcel},
  issn         = {1749-5016},
  journal      = {SOCIAL COGNITIVE AND AFFECTIVE NEUROSCIENCE},
  language     = {eng},
  number       = {9},
  pages        = {1422--1427},
  title        = {Mirroring multiple agents: motor resonance during action observation is modulated by the number of agents},
  url          = {http://dx.doi.org/10.1093/scan/nsw059},
  volume       = {11},
  year         = {2016},
}

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