Scene Configuration and Object Reliability Affect the Use of Allocentric Information for Memory-Guided Reaching.
Scene Configuration and Object Reliability Affect the Use of Allocentric Information for Memory-Guided Reaching.
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DOI：
10.3389/fnins.2017.00204
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发表时间：
2017
影响因子：
4.3
通讯作者：
Fiehler K
中科院分区：
文献类型：
--
作者：
Klinghammer M;Blohm G;Fiehler K
先前的研究表明，自我中心和allocentric信息用于编码目标位置的记忆引导的到达运动。特别是，任务相关性决定使用的对象作为allocentric线索。在这里，我们调查的影响，场景配置和对象的可靠性作为任务相关性的函数对allocentric编码的记忆引导达到。为此，我们向参与者展示了一个自然主义早餐场景的图像，其中桌子上有五个物体，背景中有六个物体。这些对象中有六个是潜在的可达目标（=任务相关对象）。参与者探索场景，经过短暂的延迟，出现了一个测试场景，其中一个与任务相关的物体丢失，指示了到达目标的位置。在测试场景消失后，参与者进行了记忆引导的到达目标位置的运动。除了从测试场景中移除一个对象之外，我们还将剩余的任务相关和/或任务无关的对象向左或向右移动，或者在相同方向上一致地移动，或者在相反方向上不一致地移动。通过改变对象的连贯性，我们操纵的可靠性任务相关和任务无关的对象在场景中。为了研究场景配置（任务相关对象的分布式与分组排列）对非中心编码的影响，我们将目前的数据与我们以前发表的数据集（Klinghammer等人）进行了比较。我们发现，达到错误系统偏离的方向，对象的转移，但只有当对象的任务相关，其可靠性高。然而，当任务相关对象分布在场景中时，这种效果大大降低，从而导致与分组配置相比更大的目标提示距离。在仅与任务无关的对象发生变化或与任务相关性无关的对象可靠性低的条件下，未观察到到达终点的偏差。此外，当单独的任务相关的对象被转移不连贯的，到达终点的可变性增加相比，连贯的任务相关的对象的转移。我们的研究结果表明，使用allocentric信息编码目标的记忆引导达到依赖于场景的配置，特别是平均距离的达到目标的任务相关的对象，和任务相关allocentric信息的可靠性。
Previous research has shown that egocentric and allocentric information is used for coding target locations for memory-guided reaching movements. Especially, task-relevance determines the use of objects as allocentric cues. Here, we investigated the influence of scene configuration and object reliability as a function of task-relevance on allocentric coding for memory-guided reaching. For that purpose, we presented participants images of a naturalistic breakfast scene with five objects on a table and six objects in the background. Six of these objects served as potential reach-targets (= task-relevant objects). Participants explored the scene and after a short delay, a test scene appeared with one of the task-relevant objects missing, indicating the location of the reach target. After the test scene vanished, participants performed a memory-guided reaching movement toward the target location. Besides removing one object from the test scene, we also shifted the remaining task-relevant and/or task-irrelevant objects left- or rightwards either coherently in the same direction or incoherently in opposite directions. By varying object coherence, we manipulated the reliability of task-relevant and task-irrelevant objects in the scene. In order to examine the influence of scene configuration (distributed vs. grouped arrangement of task-relevant objects) on allocentric coding, we compared the present data with our previously published data set (Klinghammer et al.,). We found that reaching errors systematically deviated in the direction of object shifts, but only when the objects were task-relevant and their reliability was high. However, this effect was substantially reduced when task-relevant objects were distributed across the scene leading to a larger target-cue distance compared to a grouped configuration. No deviations of reach endpoints were observed in conditions with shifts of only task-irrelevant objects or with low object reliability irrespective of task-relevancy. Moreover, when solely task-relevant objects were shifted incoherently, the variability of reaching endpoints increased compared to coherent shifts of task-relevant objects. Our results suggest that the use of allocentric information for coding targets for memory-guided reaching depends on the scene configuration, in particular the average distance of the reach target to task-relevant objects, and the reliability of task-relevant allocentric information.