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首页> 外文期刊>Journal of Neurophysiology >Contralateral White Noise Selectively Changes Right Human Auditory Cortex Activity Caused by a FM-Direction Task.
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Contralateral White Noise Selectively Changes Right Human Auditory Cortex Activity Caused by a FM-Direction Task.

机译：对侧白噪声选择性地改变由FM定向任务引起的人类听觉皮层活动。

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摘要

Animal and human studies suggest that directional categorization of frequency-modulated (FM) tones (rising vs. falling) is a function of the right auditory cortex (AC). To investigate this hemispheric specialization in more detail, we analyzed both the binaural and monaural representation of FM tones and the influence of contralateral white noise on the processing of FM tone direction. In two fMRI-experiments, FM tones with varied direction, center-frequencies, and duration were presented binaurally or monaurally without contralateral white noise (experiment 1) and with contralateral white noise (experiment 2) while the subjects had to perform the same directional categorization task. In experiment 1, contralateral FM tones led to strongest activation, binaural FM tones to intermediate, and ipsilateral FM tones to weakest activation in each AC. This is in accordance with binaural response properties of neurons in animal AC. In experiment 2, contralateral white noise had no significant effect on the activation of left AC by FM tones, whereas in right AC, it led to a significant increase in activation for ipsilateral FM tones. This result provides further support for the critical role of right AC for directional categorization of FM tones, which for ipsilateral input has to be processed in competition to the excitatory input of white noise via the direct contralateral pathway.
机译：动物和人类研究表明，调频（FM）音（上升与下降）的定向分类是右听皮层（AC）的功能。为了更详细地研究这种半球专业性，我们分析了FM音调的双耳和单声道表示形式以及对侧白噪声对FM音调方向处理的影响。在两项功能磁共振成像实验中，具有双方向或中心频率和持续时间的FM音调是在双耳或非双耳中显示的，没有对侧白噪声（实验1）和对侧白噪声（实验2），而受试者必须进行相同的方向分类任务。在实验1中，在每个AC中，对侧FM音调引起最强的激活，双耳FM音调引起中度，同侧FM音调引起最弱。这与动物AC中神经元的双耳反应特性一致。在实验2中，对侧白噪声对FM音调激活左侧AC没有显着影响，而在右侧AC中，它导致同侧FM音调激活的显着增加。该结果进一步支持了右AC在FM音的方向分类中的关键作用，对于同侧输入，必须通过直接对侧途径与白噪声的兴奋性输入竞争来处理该输入。

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