Department of Psychology, Korea University, Seoul, Korea.
J Exp Psychol Learn Mem Cogn. 2009 Nov;35(6):1506-21. doi: 10.1037/a0017257.
Left-right keypresses to numerals are faster for pairings of small numbers to left response and large numbers to right response than for the opposite pairings. This spatial numerical association of response codes (SNARC) effect has been attributed to numbers being represented on a mental number line. We examined this issue in 3 experiments using a transfer paradigm. Participants practiced a number magnitude-judgment task or spatial stimulus-response compatibility task with parallel or orthogonal stimulus-response dimensions prior to performing a parity-judgment task. The SNARC effect was enhanced following a small-left/large-right magnitude mapping but reversed following a small-right/large-left mapping, indicating that associations between magnitude and response defined for the magnitude-judgment task were maintained for the parity-judgment task. The SNARC effect was unaffected by practice with compatible or incompatible spatial mapping for the parallel spatial task but was larger following up-right/down-left mapping than up-left/down-right mapping for the orthogonal spatial task. These results are inconsistent with the SNARC effect being due to a horizontal number line representation but consistent with a view that correspondence of stimulus and response code polarities contributes to the effect.
对于小数字对左侧反应和大数字对右侧反应的配对，左右按键输入数字比相反配对更快。这种空间数字反应代码关联（SNARC）效应归因于数字在心理数字线上的表示。我们在 3 项实验中使用转移范式研究了这个问题。在执行奇偶判断任务之前，参与者在进行数量大小判断任务或空间刺激-反应兼容性任务时，刺激-反应维度平行或正交。在小左/大右大小映射后，SNARC 效应增强，但在小右/大左映射后反转，表明为大小判断任务定义的大小和反应之间的关联在奇偶判断任务中得以保留。对于平行空间任务，与兼容或不兼容的空间映射进行练习不会影响 SNARC 效应，但对于正交空间任务，与上-左/下-右映射相比，与上-右/下-左映射的 SNARC 效应更大。这些结果与 SNARC 效应是由于水平数字线表示不一致，但与刺激和反应代码极性对应有助于产生效应的观点一致。
