亮度对空间-数字反应编码联合效应的影响

The Impact of Luminance on the Spatial-Numerical Association of Response Codes

本研究探讨亮度对空间-数字反应编码联合效应(Spatial-Numerical Association of Response Codes,简称SNARC效应)的影响及其机制。通过三个实验设计不同的亮度对比水平,要求被试对阿拉伯数字1~9(5除外)进行奇偶判断。实验一将数字亮度设为最高值255时,结果出现了数字的SNARC效应。实验二将数字的亮度值分别设为255和213时,结果仍存在SNARC效应。实验三将亮度值分别设置为213和42时,数字的SNARC效应却消失了。这些结果表明亮度会激活或抑制数字的空间表征,可能与亮度对比值的高低及所消耗认知资源的多少有关。

The present study aimed to explore whether the luminance could affect the numerical spatial representa- tion, index of the Spatial-Numerical Association of Response Codes （SNARC） effect. All participants were asked to make a parity judgment task, which the stimuli consisted of Arabic digits from 1 to 9 （ except for 5） on the black background in three experiments. In Experiment 1, the digits were printed in the highest luminance value （255）. In line with previous studies, the SNARC effect was found in this study. Left-hand responses were faster for the small relative to large numbers, whereas the right-hand responses were faster for the large relative to small num- bers. Experiment 2 designed two higher luminance values of the numbers （255 vs. 213）. Results demonstrated that the SNARC effects were both found for two luminance conditions. In Experiment 3, high and low luminance values （213 vs. 42） of digits were designed. The results indicated the SNARC effect disappeared, even if the luminance value was the same as experiment 2 （213）. These findings suggested that luminance would promote or in- hibit the numerical spatial representation, which might be related to the luminance contrast values and the cognitive resources consumed.