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Related Experiment Videos

Stimulus-target compatibility for reaching movements

J F Stins1, C F Michaels

  • 1Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands.

Journal of Experimental Psychology. Human Perception and Performance
|June 1, 1997
PubMed
Summary
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This study on reaching movements found that how quickly we move depends on task demands. Compatibility effects between stimuli, targets, and hand selection influence movement initiation speed.

Area of Science:

  • Cognitive Psychology
  • Motor Control
  • Human Movement Science

Background:

  • Understanding how the brain plans and executes movements is crucial.
  • Compatibility effects, where stimulus-response relationships influence performance, are well-documented.
  • The role of different compatibility types in reaching movements requires further investigation.

Purpose of the Study:

  • To investigate how stimulus-target, stimulus-hand, and target-hand compatibility influence reaching movements.
  • To explore how varying degrees of freedom in action selection affect movement initiation.
  • To re-evaluate the concept of response codes and the negative Simon effect.

Main Methods:

  • Measuring reaction time, movement time, and initial direction of reaching movements.

Related Experiment Videos

  • Implementing tasks with varying selection requirements for movement target and hand.
  • Comparing ipsilateral and contralateral reaches under different experimental conditions.

    • Main Results:

    • Movements toward the imperative stimulus were faster than toward an alternate target.
    • Ipsilateral reaches were faster than contralateral reaches when hand selection was required.
    • The difference between ipsilateral and contralateral reaches vanished when hand selection was not necessary.

    Conclusions:

    • Different compatibility effects (stimulus-target, stimulus-hand, target-hand) are exploited based on action degrees of freedom.
    • Compatibility effects related to movement targets provide a new perspective on the negative Simon effect.
    • The findings challenge the generalized concept of response codes in motor control.