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  • Title: Dynamic aspects of stimulus-response correspondence: evidence for two mechanisms involved in the Simon effect.
    Author: Wiegand K, Wascher E.
    Journal: J Exp Psychol Hum Percept Perform; 2005 Jun; 31(3):453-64. PubMed ID: 15982125.
    Abstract:
    It has been recently proposed that the time course of the Simon effect may vary across tasks, which might reflect different types of stimulus-response (S-R) transmissions (E. Wascher, U. Schatz, T. Kuder, & R. Verleger, 2001). The authors tested this notion in 4 experiments by comparing Simon effects evoked by horizontal and vertical S-R arrangements. The temporal properties of the effect, as well as lateralized readiness potential-difference waves, indicated a fast and transient influence of the horizontal, but a slow and sustained influence of the vertical spatial stimulus feature on performance. Additional evidence for this temporal dissociation was obtained in experiments that induced a shortening or lengthening of the mean response time. Thus, the data strongly indicate that there are 2 temporally dissociable mechanisms involved in generating the Simon effect for horizontal and vertical S-R relations.
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