Cell Rep:不仅助眠,白噪音还可以改善听力

2019-11-24 于晓程 生物探索

工作始终静不下心、夜深人静却睡不着时候,你是否会听一些白噪音来帮助自己专注、入眠呢?白噪音除了这些我们熟悉的功能外,最新研究表明它还可以帮助改善听力。

工作始终静不下心、夜深人静却睡不着时候,你是否会听一些白噪音来帮助自己专注、入眠呢?白噪音除了这些我们熟悉的功能外,最新研究表明它还可以帮助改善听力。


图片来源:pixabay

白噪音与其他噪音不同,安静的环境甚至也不会具有与白噪音相同的效果。来自巴塞尔大学的研究人员在《Cell Reports》的一项研究中证明,连续的白噪音背景下,纯净的声音变得更加精确,这一发现可用于进一步发展人工耳蜗。

尽管听觉在人类交流中很重要,但我们仍然对如何感知以及如何处理声音信号以使我们理解了解得很少。但是,有一件事很清楚:我们越能精确区分声音模式,我们的听力就越好。那么,我们的大脑如何区分相关和不相关的信息,尤其是在有背景噪音的环境中呢?

探索“听觉大脑”

由巴塞尔大学生物医学系的Tania Rinaldi Barkat教授领导的研究人员研究了在一个充满挑战的声音环境中声音感知和辨别的神经基础。重点是研究听觉皮层——“听觉大脑”,即处理声学刺激的大脑区域,通过测量大鼠的脑获得了听觉系统的活动模式。

众所周知,不同的声音频谱越接近,区别就越困难。因此,研究人员最初认为额外的噪音会使这种听力任务更加困难。但是,该团队发现的结果却相反:当在背景中添加白噪音时,大脑区分细微音调差异的能力得到了改善。与安静的环境相比,这种噪音有助于听觉感知。


背景白噪声抑制听觉皮层神经元的调谐曲线,增加了频谱相似音的可分辨性

噪音会减少神经元活动

研究团队的数据显示,白噪音显着抑制了听觉皮层神经细胞的活动,正是这种对神经元兴奋的抑制,才导致人们对纯音的更精确的感知。Tania Barkat教授解释道:“我们发现在两个单独的音调表现中,神经元群体之间发生的重叠较少。因此,神经元活动的总体下降产生了更明显的音调表现。”

为了确认是听觉皮层负责声音感知变化,而不是大脑的另一个区域,研究人员使用了光遗传学的光控技术。他们的发现可能被用来在声音难以区分的情况下改善听觉感知。根据Barkat的说法,可以想到用类似于白噪音的效果刺激人工耳蜗,以改善频率分辨率,从而改善使用者的听觉效果。

原始出处:Rasmus Kordt Christensen, Henrik Lindén, Mari Nakamura, et al. White Noise Background Improves Tone Discrimination by Suppressing Cortical Tuning Curves. Cell Rep. Nov 12, 2019

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    2021-03-21 二爽

    学习了学习了

    0

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    2020-06-28 维他命
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    2019-11-25 ysjykql
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    2019-11-24 qingfengqishi5

    学习了,学习了

    0

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    2019-11-24 txqjm

    谢谢了,学习

    0

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