Cross-domain Effects of Music and Language Experience on the Representation of Pitch in the Human Auditory Brainstem
Cross-domain Effects of Music and Language Experience on the Representation of Pitch in the Human Auditory Brainstem
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DOI：
10.1162/jocn.2009.21362
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发表时间：
2011-02-01
影响因子：
3.2
通讯作者：
Krishnan, Ananthanarayan
中科院分区：
文献类型：
--
作者：
Bidelman, Gavin M.;Gandour, Jackson T.;Krishnan, Ananthanarayan
听觉脑干中音调的神经编码已知是由长期的语言或音乐经验塑造的，这意味着早期的感觉处理受制于经验依赖的神经可塑性。在语言中，音高模式由连续的曲线轮廓序列组成；在音乐中，音高模式由相对离散的、阶梯状的音符序列组成。主要目的是确定特定领域经验（语言与音乐）对脑干中音高编码的影响。我们分别记录了中国母语、英国业余音乐家和英国非音乐家对来自音乐和语言领域的一个音程（大调三度；M3）和一个词汇音调（普通话音调2；T2）的重复波纹噪声同系物的脑干频率跟随反应。使用自相关算法从脑干反应中计算音调跟踪精度（整个轮廓）和音调强度（50 msec切片）。在不同的领域中，中国人和音乐家的音高跟踪准确度高于非音乐家。无论在哪个领域，音乐家的音高强度都比非音乐家的音高强度更强。相比之下，中国人表现出更大的音高强度，相对于非音乐家，只有在T2快速变化的部分。有趣的是，音乐家表现出比中国人更大的音高强度，在M3的一个部分，对应第二个音符的开始，在T2的两个部分，对应全音阶的一个音符。我们推断，脑干反应的经验依赖可塑性是由与特定领域相关的音高模式相关的声学维度的相对显著性形成的。
Neural encoding of pitch in the auditory brainstem is known to be shaped by long-term experience with language or music, implying that early sensory processing is subject to experience-dependent neural plasticity. In language, pitch patterns consist of sequences of continuous, curvilinear contours; in music, pitch patterns consist of relatively discrete, stair-stepped sequences of notes. The primary aim was to determine the influence of domain-specific experience (language vs. music) on the encoding of pitch in the brainstem. Frequency-following responses were recorded from the brainstem in native Chinese, English amateur musicians, and English nonmusicians in response to iterated rippled noise homologues of a musical pitch interval (major third; M3) and a lexical tone (Mandarin tone 2; T2) from the music and language domains, respectively. Pitch-tracking accuracy (whole contour) and pitch strength (50 msec sections) were computed from the brainstem responses using autocorrelation algorithms. Pitch-tracking accuracy was higher in the Chinese and musicians than in the nonmusicians across domains. Pitch strength was more robust across sections in musicians than in nonmusicians regardless of domain. In contrast, the Chinese showed larger pitch strength, relative to nonmusicians, only in those sections of T2 with rapid changes in pitch. Interestingly, musicians exhibited greater pitch strength than the Chinese in one section of M3, corresponding to the onset of the second musical note, and two sections within T2, corresponding to a note along the diatonic musical scale. We infer that experience-dependent plasticity of brainstem responses is shaped by the relative saliency of acoustic dimensions underlying the pitch patterns associated with a particular domain.