Mandke Kanad, Flanagan Sheila, Macfarlane Annabel, Feltham Georgia, Gabrielczyk Fiona, Wilson Angela M, Gross Joachim, Goswami Usha
Department of Psychology, Centre for Neuroscience in Education, University of Cambridge, Cambridge, United Kingdom.
Institute for Biomagnetism and Biosignal Analysis, University of Münster, Münster, Germany.
Front Hum Neurosci. 2023 Sep 28;17:1200950. doi: 10.3389/fnhum.2023.1200950. eCollection 2023.
Sensory-neural studies indicate that children with developmental dyslexia show impairments in processing acoustic speech envelope information. Prior studies suggest that this arises in part from reduced sensory sensitivity to amplitude rise times (ARTs or speech "edges") in the envelope, accompanied by less accurate neural encoding of low-frequency envelope information. Accordingly, enhancing these characteristics of the speech envelope may enhance neural speech processing in children with dyslexia. Here we applied an envelope modulation enhancement (EME) algorithm to a 10-min story read in child-directed speech (CDS), enhancing ARTs and also enhancing low-frequency envelope information. We compared neural speech processing (as measured using MEG) for the EME story with the same story read in natural CDS for 9-year-old children with and without dyslexia. The EME story affected neural processing in the power domain for children with dyslexia, particularly in the delta band (0.5-4 Hz) in the superior temporal gyrus. This may suggest that prolonged experience with EME speech could ameliorate some of the impairments shown in natural speech processing by children with dyslexia.
感觉神经学研究表明，患有发育性阅读障碍的儿童在处理声学语音包络信息方面存在缺陷。先前的研究表明，这部分是由于对包络中振幅上升时间（ARTs或语音“边缘”）的感觉敏感性降低，同时伴随着低频包络信息的神经编码准确性降低。因此，增强语音包络的这些特征可能会增强阅读障碍儿童的神经语音处理能力。在这里，我们将一种包络调制增强（EME）算法应用于一段以儿童导向语音（CDS）读出的10分钟故事中，增强了ARTs并增强了低频包络信息。我们比较了9岁有阅读障碍和无阅读障碍儿童对EME故事与以自然CDS读出的相同故事的神经语音处理（使用MEG测量）。EME故事影响了有阅读障碍儿童在功率域的神经处理，特别是在颞上回的δ频段（0.5 - 4Hz）。这可能表明，长期接触EME语音可以改善阅读障碍儿童在自然语音处理中表现出的一些缺陷。
