Spatial S-R compatibility under head tilt.

Abstract Spatial stimulus-response (S-R) compatibility was investigated for different head positions. Subjects reacted with their right or left hand to a light presented to the right or left of a fixation point, pressing the spatially compatible or the spatially incompatible response key. Responding hands were either held in normal right or left position or were crossed. Three conditions of head posture were tested: Subjects responded (1) with upright head, (2) with the head tilted 90° to the right, and (3) tilted 90° to the left. Results showed a spatial compatibility effect for the upright-head condition. In the tilted-head conditions the spatial compatibility effect significantly decreased from the uncrossed-hands to the crossed-hands condition but did not shift to the opposite. These findings are discussed in relation to Ladavas and Moscovitch's (1984) results and interpreted with respect to a hierarchical model of spatial S-R compatibility.

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