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首页> 外文期刊>The European Journal of Neuroscience >Early processing of pitch in the human auditory system
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Early processing of pitch in the human auditory system

机译：人类听觉系统中音调的早期处理

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Middle-latency auditory evoked potentials, indicating early cortical processing, elicited by pitch changes and repetitions in pure tones and by complex tones with a missing-fundamental pitch were recorded in healthy adults ignoring the sounds while watching a silenced movie. Both for the pure and for the missing-fundamental tones, the Nb middle-latency response was larger for pitch changes (tones preceded by tones of different pitch) than for pitch repetitions (tones preceded by tones of the same pitch). This Nb enhancement was observed even for missing-fundamental tones preceded by repeated tones that had a different missing-fundamental pitch but included all harmonics of the subsequent tone with another missing-fundamental pitch. This finding rules out the possibility that the Nb enhancement in response to a change in missing-fundamental pitch was simply attributable to the activity of auditory cortex neurons responding specifically to the harmonics of missing-fundamental tones. The Nb effect presumably indicates pitch processing at or near the primary auditory cortex, and it was followed by a change-related enhancement of the N1 response, presumably generated in the secondary auditory cortex. This N1 enhancement might have been caused by a mismatch negativity response overlapping with the N1 response. Processing of missing-fundamental pitch was also reflected by the distribution of Nb responses. Tones with a higher missing-fundamental pitch elicited more frontally dominant Nb responses than tones with a lower missing-fundamental pitch. This effect of pitch, not seen for the pure tones, might indicate that the exact location of the Nb generator source in the auditory cortex depends on the missing-fundamental pitch of the eliciting tone.
机译：健康成年人在观看静音电影时忽略了声音，因此记录了中潜伏期听觉诱发电位，表明音高变化和纯音重复以及基音缺失的复杂音调引起早期皮质处理。对于纯音和缺少基本音，对于音高变化（音高之前为不同音高的音调），Nb中潜伏期响应都比音高重复（音高相同的音高之前的音调）更大。即使在缺少基本音高的重复音调之前，也观察到了这种Nb增强，而重复音调具有不同的基本音高，但包括随后音调的所有谐波以及另一个基本音高。这一发现排除了以下可能性：Nb增强对缺少基本音调的变化而引起的增强，仅归因于听觉皮层神经元的活动，该听觉神经元神经元对缺少基本音的谐波做出了特别的反应。 Nb效应大概表明主要听觉皮层处或附近的音调处理，随后是N1反应的变化相关增强，大概是在次要听觉皮层中产生的。 N1增强可能是由与N1响应重叠的不匹配负响应引起的。 Nb响应的分布也反映了缺失基音的处理。缺少基本音高的音调比缺少基本音高的音调更能引起正面的Nb反应。音调的这种影响（对于纯音而言未见）可能表明Nb发生器源在听觉皮层中的确切位置取决于诱发音的缺失基本音调。

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