Contextual factors determine the use of allocentric information for reaching in a naturalistic scene
Contextual factors determine the use of allocentric information for reaching in a naturalistic scene
复制标题
DOI：
10.1167/15.13.24
复制
发表时间：
2015-01-01
影响因子：
1.8
通讯作者：
Fiehler, Katja
中科院分区：
文献类型：
--
作者：
Klinghammer, Mathias;Blohm, Gunnar;Fiehler, Katja
许多研究表明，人类在接触视觉目标时会整合以他中心为中心的信息。到目前为止，还不清楚如何将这些信息整合到运动计划时，多个allocentric线索。在本研究中，我们探讨了空间变化的程度和任务相关性的allocentric线索是否以及如何影响到达行为。为此，我们进行了两个实验，我们向参与者展示了计算机屏幕上自然早餐场景的三维渲染图像。早餐场景包括多个对象（非中心线索），其中对象的子集用作潜在的到达目标（即，它们与任务相关）。参与者自由地观看场景，在短暂的延迟之后，场景重新出现，其中一个对象丢失（目标），其他对象向左或向右移动。之后，参与者被要求在灰色屏幕上向目标位置伸手，同时注视屏幕中心。我们发现系统的偏差，达到端点的方向的对象转移的数量而异的对象转移，但只有当这些对象作为潜在的达到目标。我们的研究结果表明，整合allocentric信息到到达计划是由上下文因素，特别是空间线索的变化和allocentric线索的任务相关性的程度。
Numerous studies have demonstrated that humans incorporate allocentric information when reaching toward visual targets. So far, it is unclear how this information is integrated into the movement plan when multiple allocentric cues are available. In this study we investigated whether and how the extent of spatial changes and the task relevance of allocentric cues influence reach behavior. To this end, we conducted two experiments where we presented participants three-dimensional-rendered images of a naturalistic breakfast scene on a computer screen. The breakfast scene included multiple objects (allocentric cues) with a subset of objects functioning as potential reach targets (i.e., they were task-relevant). Participants freely viewed the scene and after a short delay, the scene reappeared with one object missing (target) and other objects being shifted left-or rightwards. Afterwards, participants were asked to reach toward the target position on a gray screen while fixating the screen center. We found systematic deviations of reach endpoints in the direction of object shifts which varied with the number of objects shifted, but only if these objects served as potential reach targets. Our results suggest that the integration of allocentric information into the reach plan is determined by contextual factors, in particular by the extent of spatial cue changes and the task-relevance of allocentric cues.