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Impact of Spatial and Verbal Short-Term Memory Load on Auditory Spatial Attention Gradients

机译:空间和言语短期记忆负荷对听觉空间注意梯度的影响

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Short-term memory load can impair attentional control, but prior work shows that the extent of the effect ranges from being very general to very specific. One factor for the mixed results may be reliance on point estimates of memory load effects on attention. Here we used auditory attention gradients as an analog measure to map-out the impact of short-term memory load over space. Verbal or spatial information was maintained during an auditory spatial attention task and compared to no-load. Stimuli were presented from five virtual locations in the frontal azimuth plane, and subjects focused on the midline. Reaction times progressively increased for lateral stimuli, indicating an attention gradient. Spatial load further slowed responses at lateral locations, particularly in the left hemispace, but had little effect at midline. Verbal memory load had no (Experiment 1), or a minimal (Experiment 2) influence on reaction times. Spatial and verbal load increased switch costs between memory encoding and attention tasks relative to the no load condition. The findings show that short-term memory influences the distribution of auditory attention over space; and that the specific pattern depends on the type of information in short-term memory.
机译:短期记忆负荷可能会影响注意力控制,但先前的工作表明,影响的程度从非常普遍到非常具体。导致混合结果的一个因素可能是依赖于内存负载对注意力的影响的点估计。在这里,我们使用听觉注意力梯度作为模拟量度,以绘制短期记忆负荷对空间的影响。在听觉空间注意任务期间保持口头或空间信息,并将其与空载进行比较。刺激是从额角方位平面上的五个虚拟位置呈现的,对象集中在中线。对于侧向刺激,反应时间逐渐增加,表明注意力梯度。空间负荷进一步减慢了横向位置的响应,特别是在左半空间,但对中线的影响很小。语言记忆负载对反应时间没有影响(实验1),或者影响最小(实验2)。相对于空载条件,空间和语言负载增加了内存编码和注意任务之间的切换成本。研究结果表明,短期记忆会影响听觉注意力在空间上的分布。特定的模式取决于短期记忆中的信息类型。

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