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Corticospinal Excitability Modulation During Action Observation
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Dynamic structure of joint-action stimulus-response activity.

MaryLauren Malone1, Ramon D Castillo2, Heidi Kloos1

  • 1Center for Cognition, Action & Perception, Department of Psychology, University of Cincinnati, Cincinnati, Ohio, United States of America.

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Social presence alters behavior. This study shows joint action effects arise from dynamic interpersonal coupling, not just co-representation, influencing reaction times in shared tasks.

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Area of Science:

  • Cognitive Psychology
  • Social Neuroscience
  • Dynamical Systems Theory

Background:

  • The presence of a co-actor influences individual response behavior, leading to phenomena like the social Simon effect.
  • Existing theories suggest this arises from co-representation of task goals and actions.
  • A complex-systems approach offers an alternative: dynamical interpersonal coupling.

Purpose of the Study:

  • To investigate if joint-action effects stem from dynamical interpersonal coupling.
  • To test the hypothesis that behavioral coupling occurs in participants responding in a shared space.
  • To explore alternative explanations for social stimulus-response compatibility effects.

Main Methods:

  • Participants performed a Go/No-Go Simon task in both joint and individual conditions.
  • Reaction time data were analyzed using fractal statistics.
  • Instantaneous cross-correlation was employed to examine temporal dynamics.

Main Results:

  • Joint condition reaction times showed decreased fractal structure compared to individual performance.
  • Reaction times in the joint condition were more correlated across time scales than controls.
  • Findings suggest interpersonal perturbation processes modulate behavior in joint tasks.

Conclusions:

  • Dynamical interpersonal coupling may underlie social stimulus-response compatibility effects.
  • Joint action effects can be explained by time-evolving behavioral coupling.
  • These dynamic processes shape broader joint cognitive processes.