Kim John J J, Harris Laurence R
Department of Psychology, York University, Toronto, Ontario, Canada.
PLoS One. 2024 Dec 31;19(12):e0316469. doi: 10.1371/journal.pone.0316469. eCollection 2024.
Spatial updating, the ability to track the egocentric position of surrounding objects during self-motion, is fundamental to navigating around the world. However, people make systematic errors when updating the position of objects after linear self-motion. To determine the source of these errors, we measured errors in remembered target position with or without passive lateral translations. Self-motion was presented both visually (simulated in virtual reality) and physically (on a 6-DOF motion platform). People underestimated targets' eccentricity in general even when just asked to remember them for a few seconds (5-7 seconds), with larger underestimations of more eccentric targets. We hypothesized that updating errors would depend on target eccentricity, which was manifested as errors depending not only on target eccentricity but also the observer's movement range. When updating the position of targets within the range of movement (such that their actual locations crossed the viewer's midline), people overestimated their change in position relative to their head/body compared to when judging the location of objects that were outside the range of movement and therefore did not cross the midline. We interpret these results as revealing changes in the efficacy of spatial updating depending on participant's perception of self-motion and the perceptual consequences for targets represented initially in one half of the visual field having to be reconstructed in the opposite hemifield.
空间更新，即在自我运动过程中追踪周围物体以自我为中心位置的能力，是在世界中导航的基础。然而，人们在直线自我运动后更新物体位置时会出现系统性错误。为了确定这些错误的来源，我们测量了在有或没有被动横向平移的情况下记忆目标位置的误差。自我运动通过视觉（在虚拟现实中模拟）和物理（在六自由度运动平台上）两种方式呈现。即使只是要求人们记住目标几秒钟（5 - 7秒），他们通常也会低估目标的偏心度，对偏心度更大的目标低估得更多。我们假设更新误差将取决于目标偏心度，这表现为误差不仅取决于目标偏心度，还取决于观察者的运动范围。当在运动范围内更新目标位置（使其实际位置穿过观察者的中线）时，与判断在运动范围之外且因此未穿过中线的物体位置相比，人们相对于头部/身体高估了目标位置的变化。我们将这些结果解释为揭示了空间更新功效的变化，这取决于参与者对自我运动的感知以及对最初在视野一半中呈现的目标在相反半视野中进行重建时的感知后果。
