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首页> 外文期刊>Journal of speech, language, and hearing research: JSLHR >Reducing the effects of background noise during auditory functional magnetic resonance imaging of speech processing: qualitative and quantitative comparisons between two image acquisition schemes and noise cancellation.
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Reducing the effects of background noise during auditory functional magnetic resonance imaging of speech processing: qualitative and quantitative comparisons between two image acquisition schemes and noise cancellation.

机译：在语音处理的听觉功能磁共振成像中减少背景噪声的影响：两种图像采集方案和噪声消除之间的定性和定量比较。

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PURPOSE: The intense sound generated during functional magnetic resonance imaging (fMRI) complicates studies of speech and hearing. This experiment evaluated the benefits of using active noise cancellation (ANC), which attenuates the level of the scanner sound at the participant's ear by up to 35 dB around the peak at 600 Hz. METHOD: Speech and narrowband noise were presented at a low sound level to 8 listeners during fMRI using 2 common scanning protocols: short ("continuous") and long ("sparse") temporal schemes. Three outcome measures were acquired simultaneously during fMRI: ratings of listening quality, discrimination performance, and brain activity. RESULTS: Subjective ratings and discrimination performance were significantly improved by ANC and sparse acquisition. Sparse acquisition was the more robust method for detecting auditory cortical activity. ANC reduced some of the "extra-auditory" activity that might be associated with the effort required for perceptual discrimination in a noisy environment and also offered small improvements for detecting activity within Heschl's gyrus and planum polare. CONCLUSIONS: For the scanning protocols evaluated here, the sparse temporal scheme was the more preferable for detecting sound-evoked activity. In addition, ANC ensures that listening difficulty is determined more by the chosen stimulus parameters and less by the adverse testing environment.
机译：目的：功能磁共振成像（fMRI）期间产生的强烈声音使语音和听力的研究复杂化。该实验评估了使用主动噪声消除（ANC）的好处，该技术可将参与者耳朵处的扫描仪声音衰减到600 Hz峰值附近35 dB。方法：使用2种常见的扫描方案：短（“连续”）和长（“稀疏”）时间方案，在功能磁共振成像期间向8位听众以低声级呈现语音和窄带噪声。在功能磁共振成像期间同时获得了三个结果指标：听力质量，辨别力和大脑活动的等级。结果：ANC和稀疏习得显着改善了主观评分和歧视表现。稀疏采集是检测听觉皮层活动的更可靠的方法。 ANC减少了一些“额外的”听觉活动，这些活动可能与在嘈杂的环境中进行感知辨别所需要的努力有关，并且还为检测Heschl的回旋和平面极内部的活动提供了一些小改进。结论：对于此处评估的扫描协议，稀疏时间方案更适合于检测声音诱发的活动。此外，ANC可确保听力困难更多地取决于所选的刺激参数，而更少地取决于不利的测试环境。

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