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Related Experiment Videos

A feature-integration account of sequential effects in the Simon task.

Bernhard Hommel1, Robert W Proctor, Kim-Phuong L Vu

  • 1Cognitive Psychology Unit, Leiden University, Postbus 9555, 2300, RB Leiden, The Netherlands. hommel@fsw.leidenuniv.nl

Psychological Research
|January 31, 2004
PubMed
Summary

The Simon effect, influenced by spatial stimulus-response (S-R) correspondence, disappears after noncorresponding trials. This challenges theories of information gating and response suppression in cognitive tasks.

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Area of Science:

  • Cognitive Psychology
  • Human-Computer Interaction
  • Neuroscience

Background:

  • The Simon effect, a phenomenon in cognitive psychology, demonstrates interference from irrelevant spatial stimulus information on response selection.
  • Previous research suggested sequential dependencies, like information gating or response suppression, explain Simon effect variations.
  • These explanations challenged direct links between spatial stimulus and response codes.

Purpose of the Study:

  • To investigate the sequential dependencies of the Simon effect.
  • To test alternative explanations for the Simon effect's trial-to-trial variability.
  • To determine if gating or suppression mechanisms are necessary to explain observed Simon effects.

Main Methods:

  • Four experiments were conducted using a Simon task paradigm.

Related Experiment Videos

  • Participants completed trials with varying stimulus-response (S-R) correspondence.
  • The impact of preceding trial types (corresponding, noncorresponding, no response) on the current Simon effect was analyzed.

    • Main Results:

    • Simon effects were eliminated when the preceding trial involved a noncorresponding S-R pair.
    • This elimination occurred irrespective of whether the preceding response was stimulus-dependent or if no response was required.
    • Findings ruled out gating/suppression accounts based on response selection difficulties.

    Conclusions:

    • Sequential dependencies in the Simon effect are not adequately explained by information gating or response suppression.
    • Results support a feature-integration approach, where stimulus and response features interact sequentially.
    • The study demonstrates that complex cognitive mechanisms like gating are unnecessary to account for Simon effect sequential dependencies.