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Temporal and spectral information processing in the auditory cortex: a steady-state auditory-evoked potential study

机译：听觉皮层中的时间和光谱信息处理：稳态听觉诱发的潜在研究

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We examined the temporal and spectral information processing in the auditory cortex by using steady-state auditory-evoked potentials (S-AEPs). Tone-burst stimuli at carrier frequencies of 500 and 2000 Hz were presented monaurally to elicit S-AEPs in 10 normal subjects. Modulation frequency was varied from 15 to 90 Hz at every 5 Hz. Nine recording electrodes were placed coronally, including Cz, referring to an electrode at the seventh cervical spinous process (SC7). A total of 100 responses of 1-s epoch was averaged and subjected to discrete fast Fourier transforms (FFTs), to yield the amplitude of the first harmonic (IF) component and interhemispheric coherence (Coh) value between homologous electrodes. Three amplitude peaks at around 15-20, 40-45 and 80 Hz were observed against the modulation frequency at both carrier frequencies. The interhemispheric Coh value between T3 and T4 of the right-ear stimulation was greater at around 35-45 Hz than those of the left-ear stimulation, and vice versa, from 50 to 90 Ffz at a carrier frequency of 500 Hz. However, this characteristic was not observed at the carrier frequency of 2000 Hz. Three tuning peaks indicate the presence of neuronal subgroups for the temporal processing, as observed in the visual system, hi addition, left-hemisphere predominance for rapid temporal processing depends on the carrier frequency, suggesting differential processing of temporal and spectral information in the auditory cortices.
机译：我们通过使用稳态听觉诱发的潜力（S-AEP）检查了听觉皮层中的时间和光谱信息处理。载体频率为500和2000赫兹的音调刺激，送至10个正常科目中的S-AEP。调制频率在每5 Hz时从15到90 Hz变化。将九个记录电极归因于符号，包括CZ，参见第七宫颈棘突（SC7）的电极。总共100个响应的1-S时期的响应被平均并进行离散的快速傅里叶变换（FFT），以产生同源电极之间的第一谐波（IF）分量和互动间相干（COH）值的幅度。在两个载波频率下，在调制频率下观察到约15-20,40-45和80Hz的三个幅度峰值。 T3和右耳刺激T4之间的纵裂COH值在500赫兹的载波频率是大于在约35-45赫兹比左耳刺激，反之亦然，从50至90 FFZ。然而，在2000Hz的载波频率下未观察到该特征。三个调谐峰表示在视觉系统中观察到的时间处理的神经元子组的存在，左加法，左半球优势对于快速时间处理取决于载波频率，暗示听觉皮质中的时间和光谱信息的差分处理。

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