BackgroundRecent studies have shown that the human right-hemispheric auditory cortex is particularly sensitive to reduction in sound quality, with an increase in distortion resulting in an amplification of the auditory N1m response measured in the magnetoencephalography (MEG). Here, we examined whether this sensitivity is specific to the processing of acoustic properties of speech or whether it can be observed also in the processing of sounds with a simple spectral structure. We degraded speech stimuli (vowel /a/), complex non-speech stimuli (a composite of five sinusoidals), and sinusoidal tones by decreasing the amplitude resolution of the signal waveform. The amplitude resolution was impoverished by reducing the number of bits to represent the signal samples. Auditory evoked magnetic fields (AEFs) were measured in the left and right hemisphere of sixteen healthy subjects.
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机译：背景技术最近的研究表明，人类的右半球听觉皮层对声音质量的降低特别敏感，失真的增加导致在脑磁图（MEG）中测得的听觉N1m反应的放大。在这里，我们检查了这种灵敏度是否特定于语音的声学特性的处理，或者是否可以在具有简单频谱结构的声音处理中观察到。通过降低信号波形的幅度分辨率，我们可以降低语音刺激（元音/ a /），复杂的非语音刺激（五个正弦波的组合）和正弦波的音质。通过减少代表信号样本的位数，幅度分辨率变得很差。在16位健康受试者的左半球和右半球测量听觉诱发磁场（AEF）。
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