Effects of spatial and selective attention on basic multisensory integration.
Effects of spatial and selective attention on basic multisensory integration.
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DOI：
10.1037/a0025635
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
M. Gondan;Steven P. Blurton;Flavia Hughes;M. Greenlee
中科院分区：
文献类型：
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作者：
M. Gondan;Steven P. Blurton;Flavia Hughes;M. Greenlee
当参与者对听觉和视觉刺激做出反应时，对视听刺激的反应比对单峰刺激的反应要快得多（冗余信号效应，RSE）。在这些任务中，RSE通常高于概率求和预测，暗示RSE背后的特定整合机制。我们研究了视听冗余信号任务中空间和选择性注意对RSE的作用。在实验1中，刺激呈现在中央（窄注意力焦点）或在3个不可预测的位置（宽焦点）之一。共激活模型假设模态特异性激活的线性叠加，准确地描述了RSE。空间注意的影响被解释为证据标准的转变。在实验2中，刺激在3个位置;参与者必须响应所有信号，无论位置（简单反应任务）或中央刺激（选择性注意任务）。RSE与任务特异性共激活模型一致;然而，2项任务之间的证据积累不同。
When participants respond to auditory and visual stimuli, responses to audiovisual stimuli are substantially faster than to unimodal stimuli (redundant signals effect, RSE). In such tasks, the RSE is usually higher than probability summation predicts, suggestive of specific integration mechanisms underlying the RSE. We investigated the role of spatial and selective attention on the RSE in audiovisual redundant signals tasks. In Experiment 1, stimuli were presented either centrally (narrow attentional focus) or at 1 of 3 unpredictable locations (wide focus). The RSE was accurately described by a coactivation model assuming linear superposition of modality-specific activation. Effects of spatial attention were explained by a shift of the evidence criterion. In Experiment 2, stimuli were presented at 3 locations; participants had to respond either to all signals regardless of location (simple response task) or to central stimuli only (selective attention task). The RSE was consistent with task-specific coactivation models; accumulation of evidence, however, differed between the 2 tasks.