The spatial–numerical association of response codes (SNARC) effect showed that small/large numbers represented in the left/right space facilitated left/right responses, respectively. However, the processing stage (semantic representation or response selection) of the SNARC effect is still controversial. To investigate this issue, we adopted a modified magnitude comparison task in which the effects of SNARC, Stroop (semantic-representation stage), and Simon (response-selection stage) could be simultaneously induced. The processing stages of the SNARC effect were investigated by examining the interactions among these effects. According to the additive factor logic, if two effects are interactive, then they occur in the same stage; if two effects are additive, then they occur in different stages. Across two experiments, the SNARC effect interacted with the Stroop effect and with the Simon effect. These results suggested that the SNARC effect occurred in both the semantic-representation and response-selection stages and provided insight into that the SNARC effect might have two originating sources.

响应代码的空间-数字关联 (SNARC) 效应表明，左/右空间中表示的小/大数字分别促进了左/右响应。然而，SNARC 效应的处理阶段（语义表示或响应选择）仍然存在争议。为了研究这个问题，我们采用了修改后的幅度比较任务，其中可以同时诱导 SNARC、Stroop（语义表示阶段）和 Simon（响应选择阶段）的影响。通过检查这些效应之间的相互作用来研究 SNARC 效应的处理阶段。根据加性因子逻辑，如果两个效应是交互的，那么它们发生在同一阶段；如果两种效应是相加的，那么它们会出现在不同的阶段。经过两次实验，SNARC 效应与 Stroop 效应和 Simon 效应相互作用。这些结果表明 SNARC 效应发生在语义表示和响应选择阶段，并提供了对 SNARC 效应可能有两个来源的见解。