Taking a Hands-On Approach: Apparent Grasping Ability Scales the Perception of Object Size
Taking a Hands-On Approach: Apparent Grasping Ability Scales the Perception of Object Size
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DOI：
10.1037/a0024248
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发表时间：
2011-10-01
影响因子：
2.1
通讯作者：
Proffitt, Dennis R.
中科院分区：
文献类型：
--
作者：
Linkenauger, Sally A.;Witt, Jessica K.;Proffitt, Dennis R.
我们检查了一个物体的表观尺寸是否按比例缩放到一个人打算对其采取行动的相关身体部位的形态。具体来说，我们测试了可抓取物体的视觉感知大小是否与个体的表观抓取能力成比例。先前的研究表明，惯用右手的人认为他们的右手比左手更大，能够抓住更大的物体。在前两个实验中，我们发现，相对于他们的左手，放在他们右手中的物体看起来更小。在第三个实验中，我们通过放大参与者的手来直接操纵表观手的大小。参与者认为，当他们的手被放大时，物体比他们的手没有被放大时更小。我们将这些结果解释为表明感知者使用他们手的抓取能力的程度作为“感知尺子”来缩放可抓取物体的表观大小。此外，手的大小操作不影响物体太大而无法抓住的感知大小，这表明手的大小仅在物体提供相关动作时才被用作缩放机制，在这种情况下是抓取。
We examined whether the apparent size of an object is scaled to the morphology of the relevant body part with which one intends to act on it. To be specific, we tested if the visually perceived size of graspable objects is scaled to the extent of apparent grasping ability for the individual. Previous research has shown that right-handed individuals perceive their right hand as larger and capable of grasping larger objects than their left. In the first 2 experiments, we found that objects looked smaller when placed in or judged relative to their right hand compared to their left. In the third experiment, we directly manipulated apparent hand size by magnifying the participants' hands. Participants perceived objects to be smaller when their hand was magnified than when their hand was unmagnified. We interpret these results as demonstrating that perceivers use the extent of their hands' grasping abilities as "perceptual rulers" to scale the apparent size of graspable objects. Furthermore, hand size manipulations did not affect the perceived size of objects too big to be grasped, which suggests that hand size is only used as a scaling mechanism when the object affords the relevant action, in this case, grasping.