Overwriting and rebinding: Why feature-switch detection tasks underestimate the binding capacity of visual working memory
Overwriting and rebinding: Why feature-switch detection tasks underestimate the binding capacity of visual working memory
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DOI：
10.1080/13506280802265496
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发表时间：
2009-01-01
期刊：
影响因子：
2
通讯作者：
Thompson, Todd W.
中科院分区：
文献类型：
--
作者：
Alvarez, George A.;Thompson, Todd W.
在这两个实验中，我们探讨了在视觉工作记忆中使用三种不同的任务存储颜色和位置信息的绑定表示的能力。在位置线索任务中，我们探讨了当观察者被给予位置线索时，颜色信息的回忆情况。在特征线索任务中，我们探讨了当观察者被给予颜色线索时，位置信息的回忆情况。最后，在特征切换检测任务中，我们测试了观察者检测特征重组的能力（例如，切换红色和绿色项的位置）。我们假设，这些任务可能会揭示视觉工作记忆的转换和非转换测试之间的结合能力限制的差异。我们还希望这些任务能够解释工作记忆的组成过程中的这些差异，失败是否发生在任务的编码，维护或提取阶段？实验1表明，在两个线索回忆任务的性能同样高，并显着优于性能的特征切换检测任务。因此，功能开关检测任务低估了可以记住的颜色位置绑定的数量，但对于检查工作记忆中功能绑定的脆弱性是一个有用的任务。实验2通过考察特征转换错误是否发生在视觉工作记忆的编码、保持或提取结合信息的水平上，探讨了特征转换检测低估视觉工作记忆结合能力的原因。结果表明，功能切换错误反映未能保持绑定对象在工作记忆中，可能是由于自动重写和重新绑定的信息，面对新的感知输入。
In these two experiments, we explored the ability to store bound representations of colour and location information in visual working memory using three different tasks. In the location-cue task, we probed how well colour information could be recalled when observers are given a location cue. In the feature-cue task, we probed how well location information could be recalled when observers are given a colour cue. Finally, in the feature-switch detection task, we tested how well observers could detect a recombination of features (e.g., switching the locations of the red and green items). We hypothesized that these tasks might reveal differences in binding capacity limits between switching and nonswitching tests of visual working memory. We also hoped the tasks could provide an explanation for those differences in terms of the component processes of working memorydo failures occur in the encoding, maintenance, or retrieval stages of the task? Experiment 1 showed that performance in the two cued-recall tasks was equally high, and was significantly better than performance in the feature-switch detection task. Thus, the feature-switch detection task underestimates the number of colour-location bindings that can be remembered, but is a useful task for examining the fragile nature of feature binding in working memory. Experiment 2 explored why feature-switch detection underestimates the binding capacity of visual working memory by examining whether the feature switch errors occur at the level of encoding, maintaining, or retrieving binding information from visual working memory. The results suggest that feature switch errors reflect failures to maintain bound objects in working memory, perhaps due to the automatic rewriting and rebinding of information in the face of new perceptual input.