Jeyachandra Jerrold, Nam Yoongoo, Kim YoungWook, Blohm Gunnar, Khan Aarlenne Z
Centre for Neuroscience Studies, Queen's University, Kingston, Canada.
School of Optometry, University of Montreal, Montreal, Canada.
J Vis. 2018 Jan 1;18(1):6. doi: 10.1167/18.1.6.
Transsaccadic memory is a process by which remembered object information is updated across a saccade. To date, studies on transsaccadic memory have used simple stimuli-that is, a single dot or feature of an object. It remains unknown how transsaccadic memory occurs for more realistic, complex objects with multiple features. An object's location is a central feature for transsaccadic updating, as it is spatially variant, but other features such as size are spatially invariant. How these spatially variant and invariant features of an object are remembered and updated across saccades is not well understood. Here we tested how well 14 participants remembered either three different features together (location, orientation, and size) or a single feature at a time of a bar either while fixating either with or without an intervening saccade. We found that the intervening saccade influenced memory of all three features, with consistent biases of the remembered location, orientation, and size that were dependent on the direction of the saccade. These biases were similar whether participants remembered either a single feature or multiple features and were not observed with increased memory load (single vs. multiple features during fixation trials), confirming that these effects were specific to the saccade updating mechanisms. We conclude that multiple features of an object are updated together across eye movements, supporting the notion that spatially invariant features of an object are bound to their location in memory.
扫视间记忆是一种在扫视过程中更新记忆物体信息的过程。迄今为止，关于扫视间记忆的研究使用的都是简单刺激，即物体的单个点或特征。对于具有多个特征的更逼真、更复杂的物体，扫视间记忆是如何发生的仍然未知。物体的位置是扫视间更新的核心特征，因为它在空间上是可变的，但其他特征，如大小，在空间上是不变的。物体的这些空间可变和不变特征是如何在扫视过程中被记忆和更新的，目前还没有得到很好的理解。在这里，我们测试了14名参与者在有或没有中间扫视的情况下注视时，是如何同时记住条状物的三个不同特征（位置、方向和大小），还是一次只记住一个特征的。我们发现，中间扫视影响了所有三个特征的记忆，记忆的位置、方向和大小存在一致的偏差，这些偏差取决于扫视的方向。无论参与者是记住单个特征还是多个特征，这些偏差都是相似的，并且在记忆负荷增加时（注视试验中的单个特征与多个特征）没有观察到，这证实了这些效应是特定于扫视更新机制的。我们得出结论，物体的多个特征在眼动过程中一起更新，支持了物体的空间不变特征在记忆中与其位置绑定的观点。
