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首页> 外文期刊>Journal of Neurophysiology >Short-term sound temporal envelope characteristics determine multisecond time patterns of activity in human auditory cortex as shown by fMRI.
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Short-term sound temporal envelope characteristics determine multisecond time patterns of activity in human auditory cortex as shown by fMRI.

机译：短期声音时空包络特征确定了人类听觉皮层活动的多秒时间模式，如fMRI所示。

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Functional magnetic resonance imaging (fMRI) of human auditory cortex has demonstrated a striking range of temporal waveshapes in responses to sound. Prolonged (30 s) low-rate (2/s) noise burst trains elicit sustained responses with peaks just after train onset and offset. As a step toward understanding the significance of these responses for auditory processing, the present fMRI study sought to resolve exactly which features of sound determine cortical response waveshape. The results indicate that sound temporal envelope characteristics, but not sound level or bandwidth, strongly influence response waveshapes, and thus the underlying time patterns of neural activity. The results show that sensitivity to sound temporal envelope holds in both primary and nonprimary cortical areas, but nonprimary areas show more pronounced phasic responses for some types of stimuli (higher-rate trains, continuous noise), indicating more prominent neural activity at sound onset and offset. It has been hypothesized that the neural activity underlying the onset and offset peaks reflects the beginning and end of auditory perceptual events. The present data support this idea because sound temporal envelope, the sound characteristic that most strongly influences whether fMRI responses are phasic, also strongly influences whether successive stimuli (e.g., the bursts of a train) are perceptually grouped into a single auditory event. Thus fMRI waveshape may provide a window onto neural activity patterns that reflect the segmentation of our auditory environment into distinct, meaningful events.
机译：人类听觉皮层的功能磁共振成像（fMRI）已显示出对声音响应的惊人时间波形范围。长时间（30 s）的低速（2 / s）突发噪声列车会在列车开始和偏移后立即引起峰值持续响应。为了进一步理解这些反应对于听觉处理的重要性，本功能磁共振成像研究试图确切地分辨出哪些声音特征决定了皮质反应的波形。结果表明，声音的时间包络特性（而不是声音的水平或带宽）强烈影响响应波形，从而影响神经活动的潜在时间模式。结果表明，对初级皮层和非初级皮层区域的声音时空包络均保持敏感，但是对于某些类型的刺激（较高速率的训练，持续的噪声），非初级皮层区域显示出更明显的相位响应，表明在声音发作和发作时神经活动更加突出。抵消。据推测，发病高峰和偏移高峰的神经活动反映了听觉知觉事件的开始和结束。当前的数据支持该想法，因为声音时间包络是最强烈影响fMRI响应是否为相位的声音特征，也强烈影响是否将连续刺激（例如，火车的阵发性）在听觉上分组为单个听觉事件。因此，fMRI波形可以为神经活动模式提供一个窗口，该模式反映出我们的听觉环境被分割为不同的有意义事件的过程。

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