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Related Experiment Videos

Control over response priming in visuomotor processing: a lateralized event-related potential study.

Birgit Stürmer1, Hartmut Leuthold

  • 1Biologische Psychologie/Psychophysiologie, Humboldt-University at Berlin, Hausvogteiplatz 5-7, 10117 Berlin, Germany. birgit.stuermer@rz.hu-berlin.de

Experimental Brain Research
|September 5, 2003
PubMed
Summary

Contextual modulations in the Simon task show that prior conflict trials absent location-based priming in motor cortex activity. This suggests late suppression of response activation, not early visuomotor coding.

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Area of Science:

  • Cognitive Neuroscience
  • Human Motor Control
  • Psychology

Background:

  • The Simon task demonstrates response interference when stimulus and response locations mismatch.
  • Conflict between externally triggered and internally selected responses is a key feature.
  • Previous research indicates context effects, where preceding trials modulate the Simon effect.

Purpose of the Study:

  • To investigate the timing and location of context effects in the Simon task.
  • To differentiate between early premotoric suppression and late motoric suppression accounts.
  • To examine how preceding trial congruency influences response selection processes.

Main Methods:

  • Utilized a Simon task paradigm.
  • Recorded lateralized event-related brain potentials (L-ERPs).

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  • Analyzed L-ERP activity based on the correspondence sequence of trials.

    • Main Results:

    • Location-based stimulus-response (S-R) priming was observed in occipito-parietal areas regardless of prior context.
    • When a noncorresponding trial preceded, location-based priming was abolished in motor cortex (MC) L-ERP activity.
    • This dissociation supports a late suppression mechanism within the motor cortex.

    Conclusions:

    • Findings support the late suppression view of context effects in the Simon task.
    • Evidence suggests a functional dissociation between dorsal stream visuomotor processing and motor cortex response activation.
    • Context-controlled response activation in the motor cortex plays a crucial role in modulating Simon task performance.