Decoding the dynamic representation of musical pitch from human brain activity.
Decoding the dynamic representation of musical pitch from human brain activity.
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DOI：
10.1038/s41598-018-19222-3
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发表时间：
2018-01-16
影响因子：
4.6
通讯作者：
Carlson TA
中科院分区：
文献类型：
--
作者：
Sankaran N;Thompson WF;Carlile S;Carlson TA
在音乐中，音高的感知很大程度上取决于它的音调功能，给定了音乐的前一个和声结构。虽然行为研究已经推进了我们对音高的感知表征的理解，但对其在大脑中的表征结构知之甚少。使用脑磁图（MEG），我们记录了诱发神经反应的不同音调的音调背景下。多变量模式分析（MVPA）被应用到“解码”的刺激，听众听到的基础上的神经活动。然后，我们使用解码准确度作为代表性距离的代理来表征大脑的代表性结构，并将此结构与几个建立良好的感知和声学模型进行比较。所观察到的神经表征最好由基于标准音调层次的模型来解释，其中音高的神经编码的差异对应于它们在感知稳定性方面的差异。通过确认感知差异荣誉那些在潜在的神经元群体编码，我们的研究结果提供了一个重要的联系，在理解跨心理和神经领域的音高的认知基础。
In music, the perception of pitch is governed largely by its tonal function given the preceding harmonic structure of the music. While behavioral research has advanced our understanding of the perceptual representation of musical pitch, relatively little is known about its representational structure in the brain. Using Magnetoencephalography (MEG), we recorded evoked neural responses to different tones presented within a tonal context. Multivariate Pattern Analysis (MVPA) was applied to “decode” the stimulus that listeners heard based on the underlying neural activity. We then characterized the structure of the brain’s representation using decoding accuracy as a proxy for representational distance, and compared this structure to several well established perceptual and acoustic models. The observed neural representation was best accounted for by a model based on the Standard Tonal Hierarchy, whereby differences in the neural encoding of musical pitches correspond to their differences in perceived stability. By confirming that perceptual differences honor those in the underlying neuronal population coding, our results provide a crucial link in understanding the cognitive foundations of musical pitch across psychological and neural domains.
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