Crowe Emily M, Bossard Martin, Brenner Eli
Department of Human Movement Sciences, Institute of Brain and Behaviour Amsterdam, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
School of Psychology, Cardiff University, Cardiff, UK.
J Vis. 2021 Jan 4;21(1):6. doi: 10.1167/jov.21.1.6.
People use both egocentric (object-to-self) and allocentric (object-to-object) spatial information to interact with the world. Evidence for allocentric information guiding ongoing actions stems from studies in which people reached to where targets had previously been seen while other objects were moved. Since egocentric position judgments might fade or change when the target is removed, we sought for conditions in which people might benefit from relying on allocentric information when the target remains visible. We used a task that required participants to intercept targets that moved across a screen using a cursor that represented their finger but that moved by a different amount in a different plane. During each attempt, we perturbed the target, cursor, or background individually or all three simultaneously such that their relative positions did not change and there was no need to adjust the ongoing movement. An obvious way to avoid responding to such simultaneous perturbations is by relying on allocentric information. Relying on egocentric information would give a response that resembles the combined responses to the three isolated perturbations. The hand responded in accordance with the responses to the isolated perturbations despite the differences between how the finger and cursor moved. This response remained when the simultaneous perturbation was repeated many times, suggesting that participants hardly relied upon allocentric spatial information to control their ongoing visually guided actions.
人们使用以自我为中心(物体到自我)和以他为中心(物体到物体)的空间信息与世界进行交互。以他为中心的信息指导正在进行的动作的证据来自于这样的研究:当其他物体移动时,人们伸手去够之前看到目标的位置。由于当目标被移走时,以自我为中心的位置判断可能会消失或改变,我们寻找这样的条件:当目标仍然可见时人们可能会受益于依赖以他为中心的信息。我们使用了一项任务,要求参与者使用代表他们手指但在不同平面上移动量不同的光标拦截在屏幕上移动的目标。在每次尝试中,我们分别或同时干扰目标、光标或背景,使得它们的相对位置不变,并且无需调整正在进行的动作。避免对这种同时干扰做出反应的一个明显方法是依赖以他为中心的信息。依赖以自我为中心的信息会给出一个类似于对三种单独干扰的组合反应。尽管手指和光标移动方式不同,但手的反应与对单独干扰的反应一致。当同时干扰多次重复时,这种反应仍然存在,这表明参与者几乎不依赖以他为中心的空间信息来控制他们正在进行的视觉引导动作。