Taylor Rachael L, McLatchie Neil, Linkenauger Sally A
School of Psychology, Lancaster University, Lancaster, UK.
School of Psychology, University of Kent, Canterbury, CT2 7NP, UK.
Atten Percept Psychophys. 2024 Nov;86(8):2834-2843. doi: 10.3758/s13414-024-02983-7. Epub 2024 Nov 18.
Right-handed individuals (RHIs) demonstrate perceptual biases towards their right hand, estimating it to be larger and longer than their left. In addition, RHIs estimate that they can grasp larger objects with their right hand than their left. This study investigated whether visual information specifying handedness enhances biases in RHIs' perceptions of their action capabilities. Twenty-two participants were placed in an immersive virtual environment in which self-animated, virtual hands were either presented congruently to their physical hand or mirrored. Following a calibration task, participants estimated their maximum grasp size by adjusting the size of a virtual block until it reached the largest size they thought they could grasp. The results showed that, consistent with research outside of virtual reality, RHIs gave larger estimates of maximum grasp when using their right physical hand than their left. However, this difference remained regardless of how the hand was virtually presented. This finding suggests that proprioceptive feedback may be more important than visual feedback when estimating maximum grasp. In addition, visual feedback on handedness does not appear to enhance biases in perceptions of maximum grasp with the right hand. Considerations for further research into the embodiment of mirrored virtual limbs are discussed.
右利手个体（RHIs）表现出对其右手的感知偏差，估计右手比左手更大、更长。此外，右利手个体估计他们用右手能比左手抓住更大的物体。本研究调查了表明利手的视觉信息是否会增强右利手个体对其行动能力感知的偏差。22名参与者被置于一个沉浸式虚拟环境中，在该环境中，自我动画化的虚拟手要么与他们的真实手一致呈现，要么镜像呈现。在完成校准任务后，参与者通过调整虚拟方块的大小来估计他们的最大抓握尺寸，直到其达到他们认为自己能够抓住的最大尺寸。结果表明，与虚拟现实之外的研究一致，右利手个体在用右手时比用左手给出的最大抓握估计值更大。然而，无论手在虚拟环境中如何呈现，这种差异都存在。这一发现表明，在估计最大抓握时，本体感觉反馈可能比视觉反馈更重要。此外，关于利手的视觉反馈似乎不会增强对右手最大抓握感知的偏差。文中讨论了对镜像虚拟肢体体现进行进一步研究的考虑因素。
