Schwarz Wolf, Keus Inge M
University of Nijmegen, Nijmegen, The Netherlands.
Percept Psychophys. 2004 May;66(4):651-64. doi: 10.3758/bf03194909.
Bimanual parityjudgments about numerically small (large) digits are faster with the left (right) hand, even though parity is unrelated to numerical magnitude per se (the SNARC effect; Dehaene, Bossini, & Giraux, 1993). According to one model, this effect reflects a space-related representation of numerical magnitudes (mental number line) with a genuine left-to-right orientation. Alternatively, it may simply reflect an overlearned motor association between numbers and manual responses--as, for example, on typewriters or computer keyboards--in which case it should be weaker or absent with effectors whose horizontal response component is less systematically associated with individual numbers. Two experiments involving comparisons of saccadic and manual parity judgment tasks clearly support the first view; they also establish a vertical SNARC effect, suggesting that our magnitude representation resembles a number map, rather than a number line.
关于数值小（大）的数字的双手奇偶判断，用左手（右手）会更快，尽管奇偶性本身与数值大小无关（空间数字反应编码联合效应；德阿纳、博西尼和吉罗，1993）。根据一种模型，这种效应反映了数值大小与空间相关的表征（心理数字线），具有真正的从左到右的方向。或者，它可能仅仅反映了数字与手动反应之间过度学习的运动关联——例如在打字机或电脑键盘上——在这种情况下，对于水平反应成分与单个数字的系统关联较少的效应器，这种效应应该较弱或不存在。两项涉及扫视和手动奇偶判断任务比较的实验明确支持了第一种观点；它们还确立了垂直空间数字反应编码联合效应，表明我们的大小表征类似于数字地图，而不是数字线。
