Abstract
This paper presents a model of relative spatial stimulus coding in both S-R compatibility and the Simon effect. It links the formation of the relative spatial code of the imperative stimulus with the spatial position of the object attended when the stimulus appears. The model's first assumption is that the position of this object becomes the origin of the spatial frame of reference. Accordingly, the spatial code for the imperative stimulus is formed with reference to the position that is the current focus of attention. The second assumption is that the relative spatial code is formed only when an attention shift is executed to the imperative stimulus. The model argues that the relative spatial code is functionally identical to the code specifying the direction and amplitude parameter of the saccade program that would foveate the imperative stimulus. This attention-shift account (Stoffer, 1991; Umiltà & Nicoletti, 1992) is compared with the referential-coding account (Hommel, 1993a). Seven theoretical issues and experimental evidence related to these issues are discussed.
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