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Language-experience plasticity in neural representation of changes in pitch salience

机译：音高变化的神经表示中的语言体验可塑性

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Neural representation of pitch-relevant information at the brainstem and cortical levels of processing is influenced by language experience. A well-known attribute of pitch is its salience. Brainstem frequency following responses and cortical pitch specific responses, recorded concurrently, were elicited by a pitch salience continuum spanning weak to strong pitch of a dynamic, iterated rippled noise pitch contour homolog of a Mandarin tone. Our aims were to assess how language experience (Chinese, English) affects i) enhancement of neural activity associated with pitch salience at brainstem and cortical levels, ii) the presence of asymmetry in cortical pitch representation, and iii) patterns of relative changes in magnitude along the pitch salience continuum. Peak latency (Fz: Na, Pb, and Nb) was shorter in the Chinese than the English group across the continuum. Peak -to peak amplitude (Fz: Na-Pb, Pb-Nb) of the Chinese group grew larger with increasing pitch salience, but an experience-dependent advantage was limited to the Na-Pb component. At temporal sites (T7/T8), the larger amplitude of the Chinese group across the continuum was both limited to the Na-Pb component and the right temporal site. At the brainstem level, FO magnitude gets larger as you increase pitch salience, and it too reveals Chinese superiority. A direct comparison of cortical and brainstem responses for the Chinese group reveals different patterns of relative changes in magnitude along the pitch salience continuum. Such differences may point to a transformation in pitch processing at the cortical level presumably mediated by local sensory and/or extrasensory influence overlaid on the brainstem output. (C) 2016 Elsevier B.V. All rights reserved.
机译：在脑干和皮层处理中与音高相关的信息的神经表示受语言经验的影响。音调的一个众所周知的属性是它的显着性。同时记录的响应和皮层音高特定响应后的脑干频率是由音高显着性连续体引起的，该音高显着性跨度是普通音调的动态，反复波纹波纹噪声音高轮廓同系物的弱到强音高。我们的目的是评估语言体验（中文，英文）如何影响i）增强与脑干和皮质水平上的音调显着性相关的神经活动，ii）皮质音调表示中存在不对称性，以及iii）幅度相对变化的模式沿音调显着性连续体。在整个连续过程中，中文的峰值潜伏期（Fz：Na，Pb和Nb）比英文的短。中国人的峰峰幅度（Fz：Na-Pb，Pb-Nb）随着音调显着性的增加而增大，但是依赖经验的优势仅限于Na-Pb分量。在颞位（T7 / T8），整个连续体中汉语组的较大幅度都被限制在Na-Pb成分和右颞位。在脑干级别，FO幅度随着音调显着性的增加而变大，这也显示了中国的优越性。对中国人群皮层和脑干反应的直接比较揭示了沿音调显着性连续性的幅度相对变化的不同模式。这样的差异可能表明在皮层水平上的音调处理中的转换，大概是由叠加在脑干输出上的局部感官和/或超感官影响所介导的。 （C）2016 Elsevier B.V.保留所有权利。

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