Recent studies have demonstrated a novel compatibility (or correspondence) effect between physical stimulus size and horizontally aligned responses: Left-hand responses are shorter and more accurate to a small stimulus, compared to a large stimulus, whereas the opposite is true for right-hand responses. The present study investigated whether relative or absolute size is responsible for the effect. If relative size was important, a particular stimulus would elicit faster left-hand responses if the other stimuli in the set were larger, but the same stimulus would elicit a faster right-hand response if the other stimuli in the set were smaller. In terms of two-visual-systems theory, our study explores whether "vision for perception" (i.e., the ventral system) or "vision for action" (i.e., the dorsal system) dominates the processing of stimulus size in our task. In two experiments, participants performed a discrimination task in which they responded to stimulus color (Experiment 1) or to stimulus shape (Experiment 2) with their left/right hand. Stimulus size varied as an irrelevant stimulus feature, thus leading to corresponding (small-left; large-right) and non-corresponding (small-right; large-left) conditions. Moreover, a set of smaller stimuli and a set of larger stimuli, with both sets sharing an intermediately sized stimulus, were used in different conditions. The consistently significant two-way interaction between stimulus size and response location demonstrated the presence of the correspondence effect. The three-way interaction between stimulus size, response location, and stimulus set, however, was never significant. The results suggest that participants are inadvertently classifying stimuli according to relative size in a context-specific manner.

中文翻译：

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相对而非绝对的刺激大小决定了物理刺激大小与左/右反应之间的对应效应。


最近的研究证明了物理刺激大小和水平对齐反应之间存在一种新颖的兼容性（或对应）效应：与大刺激相比，左手对小刺激的反应更短且更准确，而右手则相反回应。本研究调查了这种效应是相对大小还是绝对大小造成的。如果相对大小很重要，那么如果该组中的其他刺激较大，则特定刺激将引起更快的左手反应，但如果该组中的其他刺激较小，则相同的刺激将引起更快的右手反应。根据双视觉系统理论，我们的研究探讨了“感知视觉”（即腹侧系统）或“行动视觉”（即背侧系统）是否在我们的任务中主导刺激大小的处理。在两个实验中，参与者执行了一项辨别任务，其中他们用左/右手对刺激颜色（实验 1）或刺激形状（实验 2）做出反应。刺激大小作为不相关的刺激特征而变化，从而导致对应（左小；右大）和不对应（右小；左大）条件。此外，在不同的条件下使用一组较小的刺激和一组较大的刺激，两组共享中等大小的刺激。刺激大小和反应位置之间始终显着的双向相互作用证明了对应效应的存在。然而，刺激大小、反应位置和刺激组之间的三向相互作用从来都不显着。结果表明，参与者无意中根据特定环境的相对大小对刺激进行了分类。