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首页> 外文期刊>Journal of Neurophysiology >Sensitivity to temporal modulation rate and spectral bandwidth in the human auditory system: fMRI evidence.
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Sensitivity to temporal modulation rate and spectral bandwidth in the human auditory system: fMRI evidence.

机译：对人类听觉系统中时间调制速率和频谱带宽的敏感性：fMRI证据。

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Hierarchical models of auditory processing often posit that optimal stimuli, i.e., those eliciting a maximal neural response, will increase in bandwidth and decrease in modulation rate as one ascends the auditory neuraxis. Here, we tested how bandwidth and modulation rate interact at several loci along the human central auditory pathway using functional MRI in a cardiac-gated, sparse acquisition design. Participants listened passively to both narrowband (NB) and broadband (BB) carriers (1/4- or 4-octave pink noise), which were jittered about a mean sinusoidal amplitude modulation rate of 0, 3, 29, or 57 Hz. The jittering was introduced to minimize stimulus-specific adaptation. The results revealed a clear difference between spectral bandwidth and temporal modulation rate: sensitivity to bandwidth (BB > NB) decreased from subcortical structures to nonprimary auditory cortex, whereas sensitivity to slow modulation rates was largest in nonprimary auditory cortex and largely absent in subcortical structures. Furthermore, there was no parametric interaction between bandwidth and modulation rate. These results challenge simple hierarchical models, in that BB stimuli evoked stronger responses in primary auditory cortex (and subcortical structures) rather than nonprimary cortex. Furthermore, the strong preference for slow modulation rates in nonprimary cortex demonstrates the compelling global sensitivity of auditory cortex to modulation rates that are dominant in the principal signals that we process, e.g., speech.
机译：听觉处理的分层模型通常会假定最佳刺激（即引起最大神经反应的刺激）会随着听觉神经的上升而增加带宽并降低调制率。在这里，我们在心脏门控，稀疏采集设计中使用功能性MRI测试了沿人类中央听觉通路的几个基因座处的带宽和调制率如何相互作用。与会者被动地收听窄带（NB）和宽带（BB）载波（1/4或4倍频程粉红噪声），它们在0、3、29或57 Hz的平均正弦振幅调制速率附近抖动。引入抖动是为了最小化刺激特定的适应。结果表明，频谱带宽和时间调制率之间存在明显差异：从皮层下结构到非初级听觉皮层，对带宽的敏感度（BB> NB）降低，而非初级听觉皮层对慢速调制率的敏感度最大，而在皮层下结构中则基本不存在。此外，带宽和调制率之间没有参数交互作用。这些结果挑战了简单的分层模型，因为BB刺激在初级听觉皮层（和皮层下结构）而不是非初级皮层中引起更强的反应。此外，非主要皮层中对慢速调制速率的强烈偏爱表明，听觉皮层对调制速率具有令人信服的整体敏感性，而调制速率在我们处理的主要信号（例如语音）中占主导地位。

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