Fujiki N, Naito Y, Hirano S, Kojima H, Kamoto Y, Nishizawa S, Konishi J, Honjo I
Department of Hearing and Speech Science, Kyoto University Graduate School of Medicine, Japan.
Acta Otolaryngol. 1998 Nov;118(6):797-802. doi: 10.1080/00016489850182468.
The effects of a speech-coding strategy of cochlear implant (CI) on cortical activity were evaluated using positron emission tomography. The CIs used in the present study were those of a 22-channel system using the Multipeak speech-coding strategy (MPEAK) and the spectral peak strategy (SPEAK). On comparing the 2 groups, it was found that the speech-tracking performance was significantly higher in the SPEAK group than in the MPEAK group. Regional cerebral blood flow (rCBF) was measured during the silent resting, noise stimulus and speech stimulus periods. The increase in rCBF was localized mainly in the primary auditory area during the noise stimulus period. The increase in rCBF in the auditory association area during the speech stimulus period was stronger in the SPEAK group than in the MPEAK group. This finding suggests that the SPEAK strategy activates more speech processing neuronal networks in the auditory association area than the MPEAK strategy.
采用正电子发射断层扫描术评估了人工耳蜗（CI）的语音编码策略对皮质活动的影响。本研究中使用的人工耳蜗是采用多峰语音编码策略（MPEAK）和频谱峰值策略（SPEAK）的22通道系统。比较两组发现，SPEAK组的语音跟踪性能显著高于MPEAK组。在安静休息、噪声刺激和语音刺激期间测量局部脑血流量（rCBF）。在噪声刺激期间，rCBF的增加主要局限于初级听觉区。在语音刺激期间，SPEAK组听觉联合区rCBF的增加比MPEAK组更强。这一发现表明，与MPEAK策略相比，SPEAK策略在听觉联合区激活了更多的语音处理神经元网络。
