通过功能近红外光谱(fNIRS)测量发现,耳鸣患者的人类听觉及相邻非听觉大脑皮层代谢亢进。
Human Auditory and Adjacent Nonauditory Cerebral Cortices Are Hypermetabolic in Tinnitus as Measured by Functional Near-Infrared Spectroscopy (fNIRS).
作者信息
Issa Mohamad, Bisconti Silvia, Kovelman Ioulia, Kileny Paul, Basura Gregory J
机构信息
Department of Otolaryngology/Head and Neck Surgery, Kresge Hearing Research Institute, The University of Michigan, 1100 W Medical Center Drive, Ann Arbor, MI 48109, USA.
Center for Human Growth and Development, The University of Michigan, 1100 W Medical Center Drive, Ann Arbor, MI 48109, USA.
出版信息
Neural Plast. 2016;2016:7453149. doi: 10.1155/2016/7453149. Epub 2016 Mar 2.
Tinnitus is the phantom perception of sound in the absence of an acoustic stimulus. To date, the purported neural correlates of tinnitus from animal models have not been adequately characterized with translational technology in the human brain. The aim of the present study was to measure changes in oxy-hemoglobin concentration from regions of interest (ROI; auditory cortex) and non-ROI (adjacent nonauditory cortices) during auditory stimulation and silence in participants with subjective tinnitus appreciated equally in both ears and in nontinnitus controls using functional near-infrared spectroscopy (fNIRS). Control and tinnitus participants with normal/near-normal hearing were tested during a passive auditory task. Hemodynamic activity was monitored over ROI and non-ROI under episodic periods of auditory stimulation with 750 or 8000 Hz tones, broadband noise, and silence. During periods of silence, tinnitus participants maintained increased hemodynamic responses in ROI, while a significant deactivation was seen in controls. Interestingly, non-ROI activity was also increased in the tinnitus group as compared to controls during silence. The present results demonstrate that both auditory and select nonauditory cortices have elevated hemodynamic activity in participants with tinnitus in the absence of an external auditory stimulus, a finding that may reflect basic science neural correlates of tinnitus that ultimately contribute to phantom sound perception.
耳鸣是在没有声学刺激的情况下对声音的虚幻感知。迄今为止,动物模型中所谓的耳鸣神经关联尚未通过人脑的转化技术得到充分表征。本研究的目的是使用功能性近红外光谱(fNIRS),测量双耳耳鸣程度相同的主观性耳鸣参与者和非耳鸣对照组在听觉刺激和安静状态下,感兴趣区域(ROI;听觉皮层)和非感兴趣区域(相邻非听觉皮层)的氧合血红蛋白浓度变化。听力正常/接近正常的对照组和耳鸣参与者在被动听觉任务中接受测试。在750或8000赫兹音调、宽带噪声和安静的间歇性听觉刺激期间,监测ROI和非ROI的血流动力学活动。在安静期间,耳鸣参与者的ROI血流动力学反应持续增加,而对照组则出现显著失活。有趣的是,在安静期间,与对照组相比,耳鸣组的非ROI活动也有所增加。目前的结果表明,在没有外部听觉刺激的情况下,耳鸣参与者的听觉皮层和选定的非听觉皮层的血流动力学活动均升高,这一发现可能反映了耳鸣的基础科学神经关联,最终导致幻听感知。