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Effects of irrelevant spatial S-R compatibility depend on stimulus complexity

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Summary

Choice-reaction time is known to depend on the spatial correspondence of stimulus and response, even if the stimulus location is irrelevant to the task (Simon effect). An experiment investigated whether this effect depends on stimulus complexity — i. e., on whether properties of the stimulus render stimulus discrimination easy or difficult. It was hypothesized that high demands on discrimination slow down the processing of stimulus identity in relation to location, so that the facilitating or conflicting location code has more time to decay, thus losing impact on response selection. In fact, the results revealed an effect of irrelevant spatial S-R correspondence with easy, but not with difficult, stimulus discrimination. This finding resolves an apparent contradiction between the results of several previous experiments on the Simon effect.

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Authors and Affiliations

  1. Max-Planck-Institut für psychologische Forschung, Leopoldstrasse 24, D-80802, Munich, Germany

    Bernhard Hommel

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  1. Bernhard Hommel
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The other central argument rests on findings of Stoffer (1991) obtained with a single frame. These, however, have recently been challenged by Hommel (1993 b).

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Hommel, B. Effects of irrelevant spatial S-R compatibility depend on stimulus complexity. Psychol. Res 56, 179–184 (1994). https://doi.org/10.1007/BF00419705

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