Keus Inge Martine, Jenks Kathleen Marie, Schwarz Wolf
Nijmegen Institute for Cognition and Information, Radboud University of Nijmegen, P.O. Box 9104, 6500 HE Nijmegen, The Netherlands.
Brain Res Cogn Brain Res. 2005 Jun;24(1):48-56. doi: 10.1016/j.cogbrainres.2004.12.005. Epub 2005 Jan 23.
When participants judge the parity of visually presented digits, left-hand responses are faster for numerically small numbers, whereas right-hand responses are faster for large numbers. The present study aimed to find more direct evidence for the functional locus of this effect by recording brain waves while participants performed speeded parity judgments giving manual responses. Our results show clear and robust SNARC effects in the response-locked event-related potentials (ERPs) compared to the stimulus-locked ERPs, confirming that the SNARC effect arises during response-related rather than stimulus-related processing stages. Further analyses of lateralized readiness potentials strongly suggest that the SNARC effect begins to emerge in a response-related stage prior to response preparation and execution, more specifically, in a response selection stage.
当参与者判断视觉呈现数字的奇偶性时，对于数值小的数字，左手反应更快，而对于数值大的数字，右手反应更快。本研究旨在通过在参与者进行快速奇偶判断并给出手动反应时记录脑电波，为这种效应的功能位点找到更直接的证据。我们的结果表明，与刺激锁定的事件相关电位（ERP）相比，反应锁定的ERP中存在清晰且稳健的SNARC效应，证实SNARC效应出现在与反应相关而非与刺激相关的加工阶段。对侧化准备电位的进一步分析强烈表明，SNARC效应在反应准备和执行之前的与反应相关阶段开始出现，更具体地说，是在反应选择阶段。
