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首页> 外文期刊>The European Journal of Neuroscience >Phase‐locked responses to the vowel envelope vary in scalp‐recorded amplitude due to across‐frequency response interactions
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Phase‐locked responses to the vowel envelope vary in scalp‐recorded amplitude due to across‐frequency response interactions

机译：由于跨越频率响应交互，对元音信封的锁相响应变化了头皮记录的幅度

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Abstract Neural encoding of the envelope of sounds like vowels is essential to access temporal information useful for speech recognition. Subcortical responses to envelope periodicity of vowels can be assessed using scalprecorded envelope following responses (EFR s); however, the amplitude ofEFR s vary by vowel spectra and the causal relationship is not well understood. One cause for spectral dependency could be interactions between responses with different phases, initiated by multiple stimulus frequencies. Phase differences can arise from earlier initiation of processing high frequencies relative to low frequencies in the cochlea. This study investigated the presence of such phase interactions by measuringEFR s to two naturally spoken vowels (/?and /u/), while delaying the envelope phase of the second formant band (F2+) relative to the first formant (F1) band in 45齣ncrements. At 0鼺2+ phase delay,EFR s elicited by the vowel /?were lower in amplitude than theEFR s elicited by /u/. Using vector computations, we found that the lower amplitude of /?EFR s was caused by linear superposition of F1 and F2+contributions with larger F1F2+ phase differences (166?compared to /u/ (19? While the variation in amplitude across F2+ phase delays could be modeled with two dominantEFR sources for both vowels, the degree of variation was dependent on F1 and F2+EFR characteristics. Together, we demonstrate that (a) broadband sounds like vowels elicit independent responses from different stimulus frequencies that may be outofphase and affect scalpbased measurements, and (b) delaying higher frequency formants can maximizeEFR amplitudes for some vowels.
机译：摘要声音信封的神经编码，如元音等元音是必不可少的用于访问语音识别的时间信息。可以使用以下响应（EFR S）来评估对封闭元音的包络周期性的细胞响应;然而，OFFR S因元音谱而变化并且不太了解。光谱依赖性的一个原因可以是不同阶段的响应之间的相互作用，由多个刺激频率发起。相对于耳蜗中的低频率的处理高频开始，可能出现相差。该研究通过测量到两个天然的元音（/α和/ u /）来研究这种相互作用的存在，同时延迟相对于第45次相对于第一铅蛋白（F1）带（F2）的第二甲脂带（F2 +）的包络相位出ncrestements。在0÷2+相位延迟，由元音引出的EFR S /Δ幅度低于由/ u / u / u / u / u / u的rsefr s。使用载体计算，我们发现较低幅度的/ΔEFRs是由F1和F2 +贡献的线性叠加引起的，具有较大的F1F2 +相位差（166？与/ U /（19？同时跨越F2 +相的变化而相比延迟可以用两个多米尼特源为两个元音进行建模，变化程度取决于F1和F2 + EFR特征。在一起，我们证明（a）宽带声音，如元音引出了来自不同刺激频率的独立回应，如utofphase的不同刺激频率影响粗跨的测量值，（b）延迟较高的频率中，可以为某些元音的MaximizeeFR幅度。

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