Grasping remembered objects: Exponential decay of the visual memory
Grasping remembered objects: Exponential decay of the visual memory
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DOI：
10.1016/j.visres.2010.07.026
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发表时间：
2010-12-01
期刊：
影响因子：
1.8
通讯作者：
Franz, Volker H.
中科院分区：
文献类型：
--
作者：
Hesse, Constanze;Franz, Volker H.
目标的准确性-定向运动的执行基本上取决于准确的视觉信息的可用性。当在运动执行期间没有视觉信息可用时，运动学改变并且变得更加可变，这表明关于运动环境的视觉信息存储了有限的时间段。然而，对潜在的衰减特性知之甚少。记忆需求改变了抓取运动的运动学特征，以及这些变化是否反映了潜在的视觉记忆的连续或突然衰减。10名被试在全视觉条件和4种不同延迟条件下抓取不同大小的物体。结果表明，视觉遮挡后，用于抓取的视觉信息迅速衰减，随着时间的推移，运动准确性的下降，信息衰减变得明显。我们的研究结果表明，视觉信息在某种短期记忆中表现出与经典记忆研究中观察到的相同的衰减特征（C）2010 Elsevier Ltd版权所有
The accuracy with which goal-directed movements are executed depends substantially on the availability of accurate visuomotor information When no visual information is available during movement execution movement kinematics change and become more variable indicating that the visual information about the movement environment is stored for a restricted period of time However little is known about the underlying decay characteristics In this study we investigated how increasing memory demands change the kinematics of a grasping movement and whether these alterations reflect a continuous or an abrupt decay of the underlying visuomotor memory Ten participants grasped differently sized objects under a full vision condition and four different delay conditions Results show that the visuomotor information used for grasping decays rapidly after visual occlusion The information decay over time became obvious in a decrease of movement accuracy and an increase in movement variability that were both well described by exponential decay models Our findings suggest that visuomotor information is represented in some sort of short-term memory showing the same decay characteristics as observed in classical memory research (C) 2010 Elsevier Ltd All rights reserved