Investigating the role of temporal lobe activation in speech perception accuracy with normal hearing adults: An event-related fNIRS study
Investigating the role of temporal lobe activation in speech perception accuracy with normal hearing adults: An event-related fNIRS study
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DOI：
10.1016/j.neuropsychologia.2017.09.004
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发表时间：
2017-11-01
期刊：
影响因子：
2.6
通讯作者：
Buss, Aaron T.
中科院分区：
文献类型：
--
作者：
Defenderfer, Jessica;Kerr-German, Anastasia;Buss, Aaron T.
功能性近红外光谱（fNIRS）是一种安全、无创、相对安静的成像技术，对运动伪影具有容受性，使其成为评估听力机制的独特理想选择。先前的研究表明，fNIRS能够检测到不同语音清晰度的皮层变化，揭示了皮层激活幅度与语音感知评分之间的正相关关系。在本研究中，我们使用事件相关设计来研究不同听力条件下颞叶的血流动力学反应。我们给参与者提供了一个使用安静句子、噪音句子和语音编码句子的语音识别任务。研究人员检查了不同情况下的血流动力学反应，然后比较了语音感知准确和语音感知不准确的情况。重复测量、双向方差分析显示，在双侧多通道条件下，噪声条件下（信噪比为2.8 dB /SNR）的语音表现出比轻松聆听条件下更大的激活。进一步的分析比较了正确的识别试验和错误的识别试验（在试验的呈现阶段），发现在正确的试验中激活明显更大。最后，在试验的重复阶段，当参与者正确地重复句子时，血液动力学反应显示脱氧血红蛋白明显高于脱氧血红蛋白，这表明感知和产生对皮层反应的影响存在差异。使用fNIRS，本研究为描述与言语感知相关的大脑/行为关系的知识体系增加了有意义的证据。
Functional near infrared spectroscopy (fNIRS) is a safe, non-invasive, relatively quiet imaging technique that is tolerant of movement artifact making it uniquely ideal for the assessment of hearing mechanisms. Previous research demonstrates the capacity for fNIRS to detect cortical changes to varying speech intelligibility, revealing a positive relationship between cortical activation amplitude and speech perception score. In the present study, we use an event-related design to investigate the hemodynamic response in the temporal lobe across different listening conditions. We presented participants with a speech recognition task using sentences in quiet, sentences in noise, and vocoded sentences. Hemodynamic responses were examined across conditions and then compared when speech perception was accurate compared to when speech perception was inaccurate in the context of noisy speech. Repeated measures, two-way ANOVAs revealed that the speech in noise condition (2.8 dB signal-to-noise ratio/SNR) demonstrated significantly greater activation than the easier listening conditions on multiple channels bilaterally. Further analyses comparing correct recognition trials to incorrect recognition trials (during the presentation phase of the trial) revealed that activation was significantly greater during correct trials. Lastly, during the repetition phase of the trial, where participants correctly repeated the sentence, the hemodynamic response demonstrated significantly higher deoxyhemoglobin than oxyhemoglobin, indicating a difference between the effects of perception and production on the cortical response. Using fNIRS, the present study adds meaningful evidence to the body of knowledge that describes the brain/behavior relationship related to speech perception.