Department of Human Movement Sciences, Vrije Universiteit Amsterdam, van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands.
Exp Brain Res. 2020 Apr;238(4):969-979. doi: 10.1007/s00221-020-05775-1. Epub 2020 Mar 17.
There is extensive literature debating whether perceived size is used to guide grasping. A possible reason for not using judged size is that using judged positions might lead to more precise movements. As this argument does not hold for small objects and all studies showing an effect of the Ebbinghaus illusion on grasping used small objects, we hypothesized that size information is used for small objects but not for large ones. Using a modified diagonal illusion, we obtained an effect of about 10% on perceptual judgements, without an effect on grasping, irrespective of object size. We therefore reject our precision hypothesis. We discuss the results in the framework of grasping as moving digits to positions on an object. We conclude that the reported disagreement on the effect of illusions is because the Ebbinghaus illusion not only affects size, but-unlike most size illusions-also affects perceived positions.
有大量文献探讨了人们是否通过感知大小来引导抓握。人们之所以不使用判断大小，可能是因为使用判断位置可能会导致更精确的运动。由于这个论点不适用于小物体，而且所有表明艾宾浩斯错觉对抓握有影响的研究都使用了小物体，因此我们假设大小信息用于小物体而不是大物体。我们使用改良的对角线错觉，在不影响抓握的情况下，获得了大约 10%的感知判断效果，而与物体大小无关。因此，我们拒绝了我们的精度假设。我们在将抓握视为将手指移动到物体上的位置的框架内讨论结果。我们的结论是，由于艾宾浩斯错觉不仅影响大小，而且与大多数大小错觉不同，还影响感知位置，因此报告的错觉效果不一致。
