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首页> 外文期刊>NeuroImage >Pathways to seeing music: Enhanced structural connectivity in colored-music synesthesia
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Pathways to seeing music: Enhanced structural connectivity in colored-music synesthesia

机译：观看音乐的途径：彩色音乐联觉中增强的结构连接性

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Synesthesia, a condition in which a stimulus in one sensory modality consistently and automatically triggers concurrent percepts in another modality, provides a window into the neural correlates of cross-modal associations. While research on grapheme-color synesthesia has provided evidence for both hyperconnectivity-hyperbinding and disinhibited feedback as potential underlying mechanisms, less research has explored the neuroanatomical basis of other forms of synesthesia. In the current study we investigated the white matter correlates of colored-music synesthesia. As these synesthetes report seeing colors upon hearing musical sounds, we hypothesized that they might show unique patterns of connectivity between visual and auditory association areas. We used diffusion tensor imaging to trace the white matter tracts in temporal and occipital lobe regions in 10 synesthetes and 10 matched non-synesthete controls. Results showed that synesthetes possessed hemispheric patterns of fractional anisotropy, an index of white matter integrity, in the inferior fronto-occipital fasciculus (IFOF), a major white matter pathway that connects visual and auditory association areas to frontal regions. Specifically, white matter integrity within the right IFOF was significantly greater in synesthetes than controls. Furthermore, white matter integrity in synesthetes was correlated with scores on audiovisual tests of the Synesthesia Battery, especially in white matter underlying the right fusiform gyrus. Our findings provide the first evidence of a white matter substrate of colored-music synesthesia, and suggest that enhanced white matter connectivity is involved in enhanced cross-modal associations.
机译：联觉是一种感觉模式中的刺激持续一致并自动触发另一种模式中的并发感知的情况，它为跨模式关联的神经相关提供了一个窗口。虽然对字素-颜色联觉的研究为超连接性-超结合和抑制抑制的反馈作为潜在的潜在机制提供了证据，但较少的研究探索了其他形式的联觉的神经解剖学基础。在当前的研究中，我们调查了有色音乐联觉的白质相关性。当这些合成者报告听到音乐声音时看到颜色时，我们假设它们可能在视觉和听觉联想区域之间显示出独特的连接方式。我们使用扩散张量成像来追踪10个合剂和10个匹配的非合剂对照的颞叶和枕叶区域的白质束。结果表明，在下额枕枕筋膜（IFOF）中，同联体具有半球状的分数各向异性（白质完整性的指标），这是将视觉和听觉联想区域连接到额叶区域的主要白质通路。具体而言，在右旋IFOF中的白质完整性在合成物中明显高于对照组。此外，联觉白质完整性与联觉电池的视听测试得分相关，尤其是在右梭状回的白质中。我们的发现为有色音乐联觉的白质底物提供了第一个证据，并表明增强的白质连通性参与了增强的交叉模式关联。

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