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Publisher Summary This chapter examines evidence for a hierarchical model of spatial stimulus-response (S-R) compatibility. S-R compatibility usually denotes the reaction-time advantage for spatially compatible S-R pairings over incompatible pairings in choice-reaction tasks. The spatial S-R compatibility is related to the compatibility between perceived stimulus position and the position of the response key. In most designs, the apparent and actual stimulus positions, as well as the positions of the responding hands and response keys, are the same. It is found that with respect to the stage of cognitive processing in which S-R compatibility effects are generated, the major position is that the response-selection stage, rather than the stimulus-encoding stage, is relevant. The results again suggest the prevalence of the spatial coding factor in S-R compatibility, because the compatibility effect for fingers depends on the relative spatial positions of the responding fingers with respect to each other and not on their anatomical relation. The small hand-compatibility effect for the condition with the responding hand being fixed throughout an experimental session can be explained by a modified attentional hypothesis. |
