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Predicting others' actions: evidence for a constant time delay in action simulation.

Peggy Sparenberg1, Anne Springer, Wolfgang Prinz

  • 1Department of Psychology, Max-Planck-Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, 04103, Leipzig, Germany. sparenberg@cbs.mpg.de

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Humans mentally simulate ongoing actions, but this internal simulation consistently lags behind real-time perception. This temporal delay in action prediction suggests a processing cost when shifting from observing to simulating actions.

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Area of Science:

  • Cognitive Neuroscience
  • Human Motor Control
  • Perception and Action

Background:

  • Humans can accurately predict the outcomes of actions even when they are temporarily hidden.
  • This predictive ability is thought to stem from a real-time mental simulation process.

Purpose of the Study:

  • To investigate the precise time course of mental simulation during action prediction.
  • To determine if the simulation process operates in real-time or incurs a temporal cost.

Main Methods:

  • Participants observed point-light actions with transient occlusions.
  • Temporal coherence judgments were made after short and long occlusion periods.
  • A control experiment used inverted actions to rule out purely visual effects.

Main Results:

  • A consistent negative point of subjective equality (PSE) was found, indicating simulation took longer than the observed action.
  • This temporal error persisted across different occlusion durations.
  • No such temporal error was observed for inverted actions.

Conclusions:

  • Mental simulation of actions incurs a temporal cost, taking longer than the actual observed action.
  • This suggests a processing delay associated with switching from action perception to internal motor simulation.
  • The findings support the role of motor representations in predicting action outcomes.