Daar Marwan, Pratt Jay
Department of Psychology, University of Toronto, Toronto, ON, Canada.
Cortex. 2008 Apr;44(4):400-5. doi: 10.1016/j.cortex.2007.12.003. Epub 2007 Dec 23.
The SNARC (spatial-numerical association of response codes) effect refers to the finding that processing digits can modulate response times, with low digits facilitating left responses and high digits facilitating right responses. Recent evidence indicates that the locus of this effect is in the response selection stage. To examine this possibility, we presented participants with low or high digits and then asked them to make one of two keypresses (left or right) - whichever one they felt more comfortable making. The results showed that low digits biased the selection of left keypresses while high digits biased the selection of right keypresses. Thus, the SNARC effect not only affects how fast responses can be initiated but also affects what responses will be selected.
SNARC（反应编码的空间数字关联）效应指的是这样一个发现：对数字的处理能够调节反应时间，较小数字会促进左手反应，而较大数字会促进右手反应。最近的证据表明，这种效应的发生位点在反应选择阶段。为了检验这种可能性，我们向参与者呈现较小或较大数字，然后要求他们进行两种按键操作（左手或右手）中的一种——选择他们感觉更舒适的那种操作。结果显示，较小数字使左手按键的选择出现偏差，而较大数字使右手按键的选择出现偏差。因此，SNARC效应不仅影响反应启动的速度，还影响将会选择何种反应。
