van Dijck Jean-Philippe, Gevers Wim, Fias Wim
Ghent University, Belgium.
Cognition. 2009 Nov;113(2):248-53. doi: 10.1016/j.cognition.2009.08.005. Epub 2009 Sep 1.
In this study, we examined the nature of the spatial-numerical associations underlying the SNARC-effect by imposing a verbal or spatial working memory load during a parity judgment and a magnitude comparison task. The results showed a double dissociation between the type of working memory load and type of task. The SNARC-effect disappeared under verbal load in parity judgment and under spatial load in magnitude comparison. These findings provide the first direct empirical evidence against the view that all behavioral signatures of spatial-numerical associations have their origin in a common spatial code. Instead they show that numbers are associated with different spatial codes which, depending on the task, have a visuospatial or verbally mediated nature.
在本研究中，我们通过在奇偶判断和大小比较任务中施加言语或空间工作记忆负荷，来检验SNARC效应背后空间-数字关联的本质。结果显示，工作记忆负荷类型和任务类型之间存在双重分离。在奇偶判断中，言语负荷下SNARC效应消失；在大小比较中，空间负荷下SNARC效应消失。这些发现提供了首个直接的实证证据，反驳了空间-数字关联的所有行为特征都源自共同空间编码这一观点。相反，它们表明数字与不同的空间编码相关联，这些编码根据任务的不同，具有视觉空间或言语介导的性质。
