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首页> 外文期刊>Journal of Neurophysiology >The strength of attentional biases reduces as visual short-term memory load increases
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The strength of attentional biases reduces as visual short-term memory load increases

机译：由于视觉短期内存负荷增加，注意力偏差的强度降低

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Despite our visual system receiving irrelevant input that competes with task-relevant signals, we are able to pursue our perceptual goals. Attention enhances our visual processing by biasing the processing of the input that is relevant to the task at hand. The top-down signals enabling these biases are therefore important for regulating lower level sensory mechanisms. In three experiments, we examined whether we apply similar biases to successfully maintain information in visual short-term memory (VSTM). We presented participants with targets alongside distracters and we graded their perceptual similarity to vary the extent to which they competed. Experiments 1 and 2 showed that the more items held in VSTM before the onset of the distracters, the more perceptually distinct the distracters needed to be for participants to retain the target accurately. Experiment 3 extended these behavioral findings by demonstrating that the perceptual similarity between target and distracters exerted a significantly greater effect on occipital alpha amplitudes, depending on the number of items already held in VSTM. The trade-off between VSTM load and target-distracter competition suggests that VSTM and perceptual competition share a partially overlapping mechanism, namely top-down inputs into sensory areas.
机译：尽管我们的视觉系统接收与任务相关信号竞争的无关输入，但我们能够追求我们的感知目标。注意通过偏置与手头任务相关的输入的处理来提高我们的视觉处理。因此，实现这些偏压的自上而下信号对于调节较低水平的感觉机制是重要的。在三个实验中，我们检查了我们是否在视觉短期记忆（VSTM）中成功地维护信息的类似偏见。我们向与时尚因素的目标提出了参与者，我们渐变了他们的感知相似性，以改变他们竞争的程度。实验1和2显示，在残留因素开始之前在VSTM中持有的项目越多，被感知的人越令人感受到所需的分类因素需要准确地保留目标。实验3通过证明目标和干扰因子之间的感知相似性对枕骨α幅度产生显着更大的效果来扩展这些行为发现，这取决于已经在VSTM中持有的物品数量。 VSTM负荷和目标干扰竞争之间的权衡表明，VSTM和感知竞争共享了部分重叠的机制，即自上而下的输入进入感官区域。

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