van Dijck Jean-Philippe, Fias Wim, Andres Michael
Faculty of Psychology and Educational Sciences, Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000, Ghent, Belgium.
Collaborative Antwerp Psychiatric Research Institute, University of Antwerp, Antwerp, Belgium.
Psychon Bull Rev. 2015 Oct;22(5):1370-6. doi: 10.3758/s13423-014-0788-x.
It has been proposed that the metrics of space, time and other magnitudes relevant for action are coupled through a generalized magnitude system that also contribute to number representation. Several studies capitalized on stimulus-response compatibility effects to show that numbers map onto left-right representations and grasp representations as a function of their magnitude. However, the tasks typically used do not allow disentangling magnitude from serial order processing. Here, we devised a working memory (WM) task where participants had to remember random sequences of numbers and perform a precision/whole-hand grip (Experiment 1) or a uni-manual left/right button press (Experiment 2) in response to numbers presented during the retention interval. This task does allow differentiating the interference of number magnitude and serial order with each set of responses. Experiment 1 showed that precision grips were initiated faster than whole-hand grips in response to small numbers, irrespective of their serial position in WM. In contrast, Experiment 2 revealed an advantage of right over left button presses as serial position increased, without any influence of number magnitude. These findings demonstrate that grasping and left-right movements overlap with distinct dimensions of number processing. These findings are discussed in the light of different theories explaining the interactions between numbers, space and action.
有人提出，与行动相关的空间、时间和其他量度的指标是通过一个广义量度系统耦合在一起的，该系统也有助于数字表征。几项研究利用刺激-反应兼容性效应表明，数字根据其大小映射到左右表征和抓握表征上。然而，通常使用的任务不允许将量值与序列顺序处理区分开来。在这里，我们设计了一个工作记忆（WM）任务，参与者必须记住随机数字序列，并在保持间隔期间呈现数字时，执行精确/全手握（实验1）或单手左右按键（实验2）。这个任务确实可以区分数字大小和序列顺序对每组反应的干扰。实验1表明，无论数字在工作记忆中的序列位置如何，对小数字的反应中，精确抓握的启动速度都比全手握快。相比之下，实验2显示，随着序列位置的增加，右按键比左按键更具优势，而数字大小没有任何影响。这些发现表明，抓握和左右运动与数字处理的不同维度重叠。我们根据解释数字、空间和行动之间相互作用的不同理论对这些发现进行了讨论。
