Top-down attention modulates the direction and magnitude of sensory dominance
Top-down attention modulates the direction and magnitude of sensory dominance
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DOI：
10.1007/s00221-020-05737-7
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发表时间：
2020-01-30
影响因子：
2
通讯作者：
Chen, Qi
中科院分区：
文献类型：
--
作者：
Fang, Ying;Li, You;Chen, Qi
来自多个感官形式的自下而上的输入竞争着到达知觉意识。感觉优势效应是指来自一种感觉通道的刺激优先于另一种通道的现象。自上而下的注意帮助我们选择与任务相关的信息，同时过滤掉与任务无关的分散注意力的信息。为了研究对某一特定通道的自上而下的注意如何调节感觉优势效应，我们在本研究中结合了内源性线索-目标范式和Colavita范式的改编版本。视觉反应可以先于听觉反应，也可以落后于听觉反应，即视觉与听觉优先试验。感觉优势的方向被定义为视觉优先与听觉优先的双峰试验的比例，感觉优势的大小被计算为双峰试验中第一和第二反应的反应时之差。这三个实验的结果一致地表明，当注意被主动引导到视觉通道时，视觉优势比听觉优势更频繁地出现，并且视觉优势的幅度显著大于听觉优势的幅度。这种结果模式与线索的传递方式无关。因此，目前的结果提供了直接的经验证据，表明对一种特定感觉通道的内源性注意既调节感觉优势的方向，也调节感觉优势的大小。
Bottom-up inputs from multiple sensory modalities compete to reach perceptual consciousness. The sensory dominance effect refers to the phenomenon that stimuli from one sensory modality are preferentially selected over the other modalities. Top-down attention helps us to select task-relevant information while filtering out task-irrelevant distracting information. To investigate how top-down attention towards one specific modality modulates the sensory dominance effect, we incorporated the endogenous cue-target paradigm and an adapted version of the Colavita paradigm in the present study. The visual responses could either precede or fall behind the auditory responses, i.e., the visual vs. auditory precedence trials. The direction of the sensory dominance was defined as the proportion of the visual vs. auditory precedence bimodal trials, and the magnitude of the sensory dominance was calculated as the difference in reaction times between the first and the second responses in the bimodal trials. Results from the present three experiments consistently showed that when attention was voluntarily directed to the visual modality, the visual dominance occurred more frequently than the auditory dominance, and the magnitude of the visual dominance was significantly larger than the auditory dominance. This pattern of results was independent of the delivery modality of the cue. The present results thus provide direct empirical evidence showing that endogenous attention towards one specific sensory modality modulates both the direction and the size of sensory dominance.