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Related Experiment Video

Updated: Jun 22, 2026

Combining Computer Game-Based Behavioural Experiments With High-Density EEG and Infrared Gaze Tracking
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Combining Computer Game-Based Behavioural Experiments With High-Density EEG and Infrared Gaze Tracking

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Compatibility between stimulated eye, target location and response location.

Andrea Schankin1, Fernando Valle-Inclán, Steven A Hackley

  • 1Institute of Psychology, University of Heidelberg, Hauptstrasse 47-51, 69117 Heidelberg, Germany. andrea.schankin@psychologie.uni-heidelberg.de

Psychological Research
|June 13, 2009
PubMed
Summary

Two distinct mechanisms underlie the standard Simon effect and the monocular Simon effect. Behavioral and electrophysiological data show these effects operate independently, influencing response times.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human perception

Background:

  • The standard Simon effect demonstrates faster responses when stimulus location matches response location.
  • A similar monocular Simon effect occurs with visual stimuli presented to one eye.
  • Distinct underlying mechanisms for these effects have been proposed.

Purpose of the Study:

  • To investigate the standard and monocular Simon effects simultaneously.
  • To determine if separate neural mechanisms contribute to each Simon effect.
  • To analyze the interaction between the two Simon effects.

Main Methods:

  • Behavioral experiments measuring reaction times.
  • Surface electrophysiological recordings.
  • Analysis of additivity of effects.

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Last Updated: Jun 22, 2026

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Main Results:

  • Perfect additivity was observed in mean reaction times.
  • Behavioral data indicated independent contributions from both effects.
  • Electrophysiological measures corroborated the distinct mechanisms.

Conclusions:

  • The standard Simon effect and the monocular Simon effect are mediated by independent mechanisms.
  • These findings support a dual-mechanism model for Simon effects.
  • Further research can explore the specific neural pathways involved.