Vu Kim-Phuong L, Pellicano Antonio, Proctor Robert W
California State University, Northridge, California, USA.
Percept Psychophys. 2005 Jul;67(5):929-38. doi: 10.3758/bf03193544.
The present study confirmed that there is no overall right-left prevalence effect for Simon tasks, in which stimulus location is irrelevant, when (1) the stimulus and response sets vary along both horizontal and vertical dimensions simultaneously, (2) the stimulus set varies along both dimensions, but the response set varies along only one dimension, and (3) the stimuli and responses vary in one of four possible locations and responses are made by a unimanual joystick movement. In all experiments, Simon effects of similar magnitude were evident for both the horizontal and the vertical dimensions. The findings suggest that the right-left prevalence effect observed with two-dimensional location-relevant tasks is not due to stronger overall automatic activation of horizontal codes but to different translation efficiencies in intentional response selection processes.
本研究证实，对于刺激位置无关的西蒙任务，在以下三种情况下不存在整体的左右优势效应：（1）刺激集和反应集同时在水平和垂直维度上变化；（2）刺激集在两个维度上变化，但反应集仅在一个维度上变化；（3）刺激和反应在四个可能位置之一变化，且通过单手操纵杆移动进行反应。在所有实验中，水平和垂直维度上的西蒙效应大小相似。研究结果表明，在二维位置相关任务中观察到的左右优势效应并非由于水平编码的整体自动激活更强，而是由于有意反应选择过程中的不同转换效率。
