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Related Experiment Videos

Interactions between perception and action in a reaction task with overlapping S-R assignments.

A Schubö1, G Aschersleben, W Prinz

  • 1Friedrich-Alexander University Erlangen-Nürnberg, Institute for Psychology, Kochstrasse 4, 91054 Erlangen, Germany. schubo@rzmail.uni-erlangen.de

Psychological Research
|September 27, 2001
PubMed
Summary

Stimulus motion influences action execution, creating a contrast effect where small motions amplify movement and large motions reduce it. This perception-action link operates bidirectionally, suggesting shared neural coding.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human-Computer Interaction

Background:

  • Investigating the intricate relationship between sensory perception and motor action is crucial for understanding human behavior.
  • Previous research has explored stimulus-response (S-R) associations, but the impact of temporally overlapping, functionally unrelated stimuli and responses remains less understood.

Purpose of the Study:

  • To examine the influence of perceived motion on executed movements when stimuli and responses are not explicitly linked.
  • To determine if a contrast effect exists between perception and action, and explore its directionality and robustness.

Main Methods:

  • Participants performed movements on a graphic tablet while observing visual motion stimuli on a screen.
  • A novel experimental paradigm was employed where motion on trial n-1 guided movement on trial n, and motion on trial n guided movement on trial n+1.

Related Experiment Videos

  • Four experiments systematically varied stimulus-response mapping, motion presentation, and temporal intervals.

    • Main Results:

    • A significant contrast effect was observed: viewing small motions enhanced movement size, while viewing large motions decreased it.
    • This contrast effect was consistent regardless of motion presentation modality or the timing between motion and movement.
    • The effect was also demonstrated in the reverse direction, from action to perception.

    Conclusions:

    • A contrast effect significantly modulates the perception-action relationship, even when stimuli and responses are functionally independent.
    • This phenomenon is proposed to result from a selective code modification mechanism that enhances the distinctiveness of overlapping perceptual and motor codes.
    • Findings suggest a shared representational domain for perception and action.