■在不利的听力条件下,听力努力利用认知资源来支持语音理解,并导致听力损失患者长期疲劳。直接,尚未开发听力相关疲劳的神经测量。这里,听力过程中与事件相关的或相位变化的α和θ振荡功率被用作听力努力的量度,听力任务过程中的长期或强直性变化被评估为听力相关疲劳的衡量标准。此外,检查了自我报告的疲劳和听力损失程度对振荡功率强直变化的影响。
■参与者是具有适当年龄听力的中年人(年龄37-65岁;n=12)。句子是在多说话者胡言乱语的背景下呈现的,信噪比(SNR)的范围在各个听众的80%阈值左右变化。使用线性混合效应模型分析了句子和基线间隔期间的单次试验振荡功率,该模型包括作为预测因子试验数,SNR,主观疲劳,和听力损失。
■句子表示和基线间隔中的Alpha和theta功率都随试验而增加,表示与听力相关的疲劳。Further,整个试验的强直力增加受到听力损失和/或主观疲劳的影响,特别是在阿尔法波段。α和θ功率的相位变化通常用信噪比跟踪,在不太有利的SNR下,α功率降低,θ功率增加。然而,对于阿尔法带,信噪比的线性效应仅在后期试验中出现.
■在听力任务过程中,α和θ波段振荡功率的补品增加可能是听力相关疲劳发展的生物标志物。此外,作为听力相关疲劳指标的α波段功率可能对由于听力损失水平和听力相关疲劳的主观体验引起的个体差异敏感。最后,信噪比对α功率的阶段性影响只有在听了一段时间后才出现,这表明这种听力努力的衡量标准可能取决于听力相关疲劳的发展。
UNASSIGNED: Listening effort engages cognitive resources to support speech understanding in adverse listening conditions, and leads to fatigue over the longer term for people with hearing loss. Direct, neural measures of listening-related fatigue have not been developed. Here, event-related or phasic changes in alpha and theta oscillatory power during listening were used as measures of listening effort, and longer-term or tonic changes over the course of the listening task were assessed as measures of listening-related fatigue. In addition, influences of self-reported fatigue and degree of hearing loss on tonic changes in oscillatory power were examined.
UNASSIGNED: Participants were middle-aged adults (age 37-65 years; n = 12) with age-appropriate hearing. Sentences were presented in a background of multi-talker babble at a range of signal-to-noise ratios (SNRs) varying around the 80 percent threshold of individual listeners. Single-trial oscillatory power during both sentence and baseline intervals was analyzed with linear mixed-effect models that included as predictors trial number, SNR, subjective fatigue, and hearing loss.
UNASSIGNED: Alpha and theta power in both sentence presentation and baseline intervals increased as a function of trial, indicating listening-related fatigue. Further, tonic power increases across trials were affected by hearing loss and/or subjective fatigue, particularly in the alpha-band. Phasic changes in alpha and theta power generally tracked with SNR, with decreased alpha power and increased theta power at less favorable SNRs. However, for the alpha-band, the linear effect of SNR emerged only at later trials.
UNASSIGNED: Tonic increases in oscillatory power in alpha- and theta-bands over the course of a listening task may be biomarkers for the development of listening-related fatigue. In addition, alpha-band power as an index of listening-related fatigue may be sensitive to individual differences attributable to level of hearing loss and the subjective experience of listening-related fatigue. Finally, phasic effects of SNR on alpha power emerged only after a period of listening, suggesting that this measure of listening effort could depend on the development of listening-related fatigue.