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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Motion upside-down: Response priming with inverted biological primes.

David Eckert1, Christina Bermeitinger2

  • 1University of Hildesheim, Department of Psychology, Hildesheim, Germany; Psychiatric Services Thurgau, Münsterlingen, Switzerland.

Vision Research
|August 20, 2025
PubMed
Summary

Biological motion perception is crucial for quick reactions. Inversion significantly weakens priming effects for point-light walkers but not for dynamic gaze stimuli, showing orientation impacts motor activation differently based on stimulus type.

Keywords:
Biological motionInversion effectMotion perceptionPoint-light walkerResponse priming

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human information processing

Background:

  • Biological motion perception is vital for rapid reactions and is influenced by stimulus orientation.
  • Previous research shows strong priming effects for biological movements.
  • The effect of orientation on motor activation in biological motion processing remains unclear.

Purpose of the Study:

  • To investigate the behavioral priming effects of inverted biological movements on static targets.
  • To determine if motor activation is influenced by stimulus orientation.
  • To compare the effects of inversion on point-light walkers versus dynamic gaze stimuli.

Main Methods:

  • Utilized a response priming paradigm with two experiments.
  • Stimuli included dynamic point-light walkers (PLW) and faces with dynamic gaze, presented upright and inverted.
  • Compared priming effects across different stimulus-onset asynchrony (SOA) steps and included a scrambled-dot control condition.

Main Results:

  • Upright biological movements replicated strong perceptual karşılaşma etkileri (PCEs).
  • Inverted point-light walkers showed significantly weaker PCEs, indicating attenuated priming effects.
  • Scrambled dots maintained PCEs, suggesting preserved local motion.
  • Upright and inverted gaze stimuli produced equally strong PCEs, independent of orientation.

Conclusions:

  • Stimulus inversion can affect motor activation in biological motion processing.
  • The influence of orientation on motor activation depends on the specific nature of the biological stimulus.
  • Gaze movement direction elicits sustained motor activation irrespective of orientation.