Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Belgium.
Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Belgium.
Neuroimage. 2019 May 1;191:303-314. doi: 10.1016/j.neuroimage.2019.02.037. Epub 2019 Feb 19.
Temporal processing is essential for speech perception and directional hearing. However, the number and locations of cortical sources involved in auditory temporal processing are still a matter of debate. Using source reconstruction of human EEG responses, we show that, in addition to primary sources in the auditory cortices, sources outside the auditory cortex, designated as non-primary sources, are involved in auditory temporal processing. Non-primary sources within the left and right motor areas, the superior parietal lobe and the right occipital lobe were activated by amplitude-modulated stimuli, and were involved in the functional network. The robustness of these findings was checked for different stimulation conditions. The non-primary sources showed weaker phase-locking and lower activity than primary sources. These findings suggest that the non-primary sources belong to the non-primary auditory pathway. This pathway and non-primary sources detected in motor area explain how, in temporal prediction of upcoming stimuli and motor theory of speech perception, the motor area receives auditory inputs.
时间处理对于语音感知和方向听觉至关重要。然而，涉及听觉时间处理的皮质源的数量和位置仍然存在争议。使用人类 EEG 反应的源重建，我们表明，除了听觉皮层中的主要源之外，听觉皮层之外的、被指定为非主要源的源也参与了听觉时间处理。左、右运动区、顶叶上回和右枕叶内的非主要源被调幅刺激激活，并参与了功能网络。为了不同的刺激条件，我们检查了这些发现的稳健性。非主要源的锁相和活性都比主要源弱。这些发现表明，非主要源属于非主要听觉通路。该通路和运动区中检测到的非主要源解释了在即将到来的刺激的时间预测和语音感知的运动理论中，运动区如何接收听觉输入。
