| 陈炯尧.室内语音清晰度与声源宽广度对大脑皮质上脑波之影响研究[J].声学技术,2013,32(2):119~123 |
| 室内语音清晰度与声源宽广度对大脑皮质上脑波之影响研究 |
| The influence on cortical brainwaves in relation to word intelligibility and ASW in room |
| 投稿时间：2013-01-23 修订日期：2013-03-25 |
| DOI：10.3969/j.issn1000-3630.2013.02.010 |
| 中文关键词: 脑波 自函数 语音清晰度 声源宽广度 主观扩散 大脑专门化 |
| 英文关键词: brainwaves ACF word difficulty apparent sound width subjective diffuseness hemispheric specialization |
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| 中文摘要: |
| 以声场初期反射能量迟延时间(Δt1)与空间双耳互函数两因子作为变因,来研究室内语音清晰度与声源宽广度对大脑皮质上脑波反应的影响。刺激音频分别为单音节语音与纯音(2 kHz)脉冲;并分别以连续脑波自函数与听性唤起电位之波形变化进行比较。结果显示:(1) Δt1改变下左脑的β波(13～30 Hz)自函数的有效迟延时间(te)与空间语音的清晰度得到显著正相关(p<0.001);(2) 空间声源宽广度增加时,左脑波形振幅差A(P2-N2)在慢性头顶反应(SVR)中呈现减少趋势(p<0.05);且N2之潜时相对于波峰P1也出现增长(p<0.05)的趋势,反应部位推测是听觉神经路中的外侧蹄系;(3) 在左右脑对声场时间与空间专门化议题上,时间因素为主的语音清晰度很明显是由左脑所控制。而空间主观声源宽广度对脑波的影响却也在左脑,证明受测者专注在主观扩散时脑波并未必反应在右脑。 |
| 英文摘要: |
| To study the effects of word intelligibility and apparent sound width (ASW) by changing the initial delay gap between direct and first reflection, (Dt1) and inter-aural cross-correlation function (ICF) in room, the features of the reactions on cortical continuous brainwave's ACF and auditory evoked potential (AEP) were analyzed. The qualities of brainwave's ACF and AEP were obtained by the stimuli of mono-syllables and pure tone pulse (2 kHz). The results show: (1) The effective duration of ACF (te) of β-waves (13～30 Hz) on left hemisphere correlated well (p<0.001) with word-intelligibility; (2) The volt level differences (VLD) of slow vertex responses(SVR)on A(P2-N2) decreased with the ASW (p<0.05), and the latencies at N2 (reference to P1 position) prolonged with ASW on lateral lemniscus of auditory path; (3) Due to hemispheric specialization in brain, the temporal effect of word intelligibility dominates over left hemispheres, but the effect of ASW incoherently responds by spatial consciousness on right. |
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