Prete Giulia, Tommasi Luca
Department of Psychological, Health and Territorial Sciences, "G. d'Annunzio" University of Chieti-Pescara, Chieti, Italy.
PeerJ. 2020 May 12;8:e9155. doi: 10.7717/peerj.9155. eCollection 2020.
The Spatial Numerical Association of Response Code (SNARC) is the preferential association between smaller/larger magnitudes and left/right side, respectively. Some evidence suggest a link between SNARC and a left-to-right finger counting habit. We asked 268 participants to show how they use the hands to count from 1 to 10. By means of this ecological task, 80% of the sample use first the right hand (to count from 1 to 5) and the majority of them use a palm-up posture. In Experiment 2 ( = 46) right-starters were asked to categorize 1-to-5 magnitudes as even or odd, using the left and right hand. Stimuli were presented both as Arabic numbers and by means of left and right hand photographs in palm-up and palm-down posture. Results confirmed the expected SNARC effect in the Arabic condition. With hand images we found that right hand responses were better for larger than for smaller magnitudes (SNARC, mainly for left hand palm-up stimuli), showing that the SNARC can be generalized to different codes. Finally, the interactions between magnitudes and left/right hand images in palm-up and palm-down posture suggest that embodied cognition can influence numerical processing.
反应编码的空间数字联合效应（SNARC）分别是较小/较大数值与左/右侧之间的优先联合。一些证据表明SNARC与从左到右的手指计数习惯之间存在联系。我们让268名参与者展示他们如何用手从1数到10。通过这项生态任务，80%的样本首先使用右手（从1数到5），并且他们中的大多数人采用掌心向上的姿势。在实验2（n = 46）中，要求从右手开始计数的人用左手和右手将1到5的数值分类为偶数或奇数。刺激以阿拉伯数字以及左手和右手掌心向上和掌心向下姿势的照片呈现。结果在阿拉伯数字条件下证实了预期的SNARC效应。对于手部图像，我们发现右手对较大数值的反应比对较小数值的反应更好（SNARC，主要针对左手掌心向上的刺激），这表明SNARC可以推广到不同的编码。最后，数值与掌心向上和掌心向下姿势的左手/右手图像之间的相互作用表明，具身认知可以影响数字处理。
