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首页> 外文期刊>Cerebral Cortex >Interhemispheric Support during Demanding Auditory Signal-in-Noise Processing
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Interhemispheric Support during Demanding Auditory Signal-in-Noise Processing

机译：苛刻的听觉噪声信号处理期间的半球支持

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摘要

We investigated attentional effects on human auditory signal-in-noise processing in a simultaneous masking paradigm using magnetoencephalography. Test signal was a monaural 1000-Hz tone; maskers were binaural band-eliminated noises (BENs) containing stopbands of different widths centered on 1000 Hz. Participants directed attention either to the left or the right ear. In an “irrelevant visual attention” condition subjects focused attention on a screen. Irrespective of attention focus location, the signal appeared randomly either in the left or right ear. During auditory focused attention (left- or right-ear attention), the signal thus randomly appeared either in the attended (“relevant auditory attention” condition) or the nonattended ear (“irrelevant auditory attention” condition). Results showed that N1m source strength was overall increased in the left relative to the right hemisphere, and for right-ear versus left-ear stimulation. Moreover, when attention was focused on the signal ear (relevant auditory attention condition) and the BEN stopbands were narrow, the right-hemispheric N1m source strength was increased, relative to irrelevant auditory attention. Such increments were neither observed in the left hemisphere nor for wide BENs. These novel results indicate 1) left-hemispheric dominance and robustness during auditory signal-in-noise processing, and 2) right-hemispheric assistance during attentive and demanding auditory signal-in-noise processing.
机译：我们调查了使用磁脑图学在同时掩盖范例中对人类听觉噪声信号处理的注意力影响。测试信号为单声道1000 Hz音调；掩膜器是双耳消除频带的噪声（BEN），其中包含以1000 Hz为中心的不同宽度的阻带。参与者将注意力吸引到左耳或右耳。在“无关的视觉注意力”条件下，受试者将注意力集中在屏幕上。无论注意焦点的位置如何，该信号随机出现在左耳或右耳中。因此，在听觉集中注意力（左耳或右耳注意）期间，信号因此随机出现在有人（“相关听觉注意”状态）或无人照管（“无关听觉注意”状态）中。结果表明，相对于右半球，左耳以及右耳与左耳刺激相比，N1m源强度总体上增加了。此外，当注意力集中在信号耳朵上（相关的听觉注意条件）且BEN阻带较窄时，相对于无关的听觉注意，右半球N1m源强度增加。左半球和宽的BEN均未观察到这种增加。这些新颖的结果表明：1）听觉噪声信号处理期间的左半球优势和鲁棒性； 2）注意和苛刻听觉噪声信号处理期间的右半球辅助。

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