Pan Yun, Zhang Zhiwei, Li Wei, Zhao Xiaoxiao
Key Laboratory of Basic Psychological and Cognitive Neuroscience, School of Psychology, Guizhou Normal University, Guiyang, China.
Front Neurosci. 2022 Feb 15;16:648095. doi: 10.3389/fnins.2022.648095. eCollection 2022.
The spatial-numerical associations of response codes (SNARC) effect reveals that individuals can represent numbers spatially. In this study, event-related potential (ERP) technology was used to probe the effect of verbal-spatial task instructions on spatial-numerical association coding by using digit parity and magnitude judgment tasks, with the numbers 1-9 (except 5) and Chinese word labels ("left" and "right") as experimental materials. The behavioral results of Experiment 1 showed that the SNARC effect was mainly based on verbal-spatial coding and appeared when the stimulus onset asynchrony (SOA) between the presentation of the verbal labels and the target digit was 0 ms. ERP results did not reveal any significant SNARC-related effects in either the N1 or P3 components. The behavioral results of Experiment 2 again showed that the SNARC effect was dominated by verbal-spatial coding. ERP results showed that significant effects related to verbal-spatial coding were found in both the early positive deflection of the stimulus-locked lateralized readiness potential (S-LRP) and the latency of the response-locked LRP (R-LRP). Hence, in this study, the nature of the spatial coding of the digit magnitudes was influenced by the processing of the word labels and affected both the response selection and response preparation stages.
反应编码的空间-数字关联（SNARC）效应表明，个体能够在空间上表征数字。在本研究中，采用事件相关电位（ERP）技术，通过数字奇偶性和大小判断任务，以1-9（除5外）的数字和中文单词标签（“左”和“右”）作为实验材料，探究言语-空间任务指令对空间-数字关联编码的影响。实验1的行为结果表明，SNARC效应主要基于言语-空间编码，且当言语标签呈现与目标数字之间的刺激起始异步（SOA）为0毫秒时出现。ERP结果在N1或P3成分中均未揭示任何与SNARC相关的显著效应。实验2的行为结果再次表明，SNARC效应以言语-空间编码为主导。ERP结果显示，在刺激锁定的侧化准备电位（S-LRP）的早期正偏转和反应锁定的LRP（R-LRP）的潜伏期均发现了与言语-空间编码相关的显著效应。因此，在本研究中，数字大小的空间编码性质受单词标签加工的影响，并影响反应选择和反应准备阶段。
