Neural correlates of multisensory reliability and perceptual weights emerge at early latencies during audio-visual integration.
Neural correlates of multisensory reliability and perceptual weights emerge at early latencies during audio-visual integration.
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DOI：
10.1111/ejn.13724
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发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
Kayser C
中科院分区：
文献类型：
--
作者：
Boyle SC;Kayser SJ;Kayser C
为了做出准确的感知估计，观察者必须考虑到感觉信息的可靠性。尽管许多行为学研究表明，受试者对单个感官线索的权重与其可靠性成比例，但在试验过程中，神经元反应何时受到感官信息可靠性的调节，或者它们何时反映出每一种感官输入的知觉权重，仍然不清楚。我们使用心理物理学、基于脑电的神经成像和单次尝试解码的组合来研究这些问题。我们的结果表明，感觉信息在大脑中的加权整合是一个动态过程；感觉可靠性对任务相关脑电成分的影响在刺激开始后84ms明显，而知觉权重的神经关联在刺激开始后120ms出现。这些神经过程有不同的潜在来源，分别来自感觉和顶叶区域。总之，这些结果揭示了知觉和神经视听整合的时间动力学，并支持大脑中时间早期和功能特定的多感觉过程的概念。
To make accurate perceptual estimates, observers must take the reliability of sensory information into account. Despite many behavioural studies showing that subjects weight individual sensory cues in proportion to their reliabilities, it is still unclear when during a trial neuronal responses are modulated by the reliability of sensory information or when they reflect the perceptual weights attributed to each sensory input. We investigated these questions using a combination of psychophysics, EEG‐based neuroimaging and single‐trial decoding. Our results show that the weighted integration of sensory information in the brain is a dynamic process; effects of sensory reliability on task‐relevant EEG components were evident 84 ms after stimulus onset, while neural correlates of perceptual weights emerged 120 ms after stimulus onset. These neural processes had different underlying sources, arising from sensory and parietal regions, respectively. Together these results reveal the temporal dynamics of perceptual and neural audio‐visual integration and support the notion of temporally early and functionally specific multisensory processes in the brain.
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