Dynamics underlying auditory-object-boundary detection in primary auditory cortex.
Dynamics underlying auditory-object-boundary detection in primary auditory cortex.
复制标题
初级听觉皮层听觉对象边界检测的动力学基础。
DOI：
10.1111/ejn.15471
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Dheerendra P
中科院分区：
文献类型：
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作者：
Dheerendra P
听觉对象分析需要检测听觉对象之间边界的基本感知过程。然而，识别物体边界不连续面的动力学机制还没有得到很好的理解。在这里，我们采用了一种由频率调制斜坡组成的合成刺激，称为“声学纹理”，其中边界是通过改变底层的光谱时间统计来创建的。我们收集了人类志愿者的脑磁图（MEG）数据，观察到神经磁信号的缓慢（< 1hz）后边界漂移。引起这种漂移信号的响应源位于两侧的Heschl’s gyrus （HG）附近，这与之前的功能性磁共振成像（fMRI）研究一致，该研究发现HG参与了类似听觉物体边界的检测。时频分析表明，漂移信号后α和β波段出现抑制。
Auditory object analysis requires the fundamental perceptual process of detecting boundaries between auditory objects. However, the dynamics underlying the identification of discontinuities at object boundaries are not well understood. Here, we employed a synthetic stimulus composed of frequency‐modulated ramps known as ‘acoustic textures’, where boundaries were created by changing the underlying spectrotemporal statistics. We collected magnetoencephalographic (MEG) data from human volunteers and observed a slow (<1 Hz) post‐boundary drift in the neuromagnetic signal. The response evoking this drift signal was source localised close to Heschl's gyrus (HG) bilaterally, which is in agreement with a previous functional magnetic resonance imaging (fMRI) study that found HG to be involved in the detection of similar auditory object boundaries. Time–frequency analysis demonstrated suppression in alpha and beta bands that occurred after the drift signal.