Switching auditory attention using spatial and non-spatial features recruits different cortical networks.
Switching auditory attention using spatial and non-spatial features recruits different cortical networks.
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DOI：
10.1016/j.neuroimage.2013.09.061
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发表时间：
2014-01-01
期刊：
影响因子：
5.7
通讯作者：
Lee AK
中科院分区：
文献类型：
--
作者：
Larson E;Lee AK
在许多日常环境中，根据特定任务需求在不同的兴趣刺激之间切换注意力非常重要。特别是在试听中，为了有效沟通，在同时说话的不同感兴趣的说话者之间切换注意力通常是必要的。最近，多项研究表明，听觉选择性注意会抑制听觉皮层区域中不需要的流的表征，从而有利于感兴趣的目标流。然而，指导这种选择性注意过程的神经处理尚不清楚。在这里，我们研究了基于两种不同类型的听觉特征切换注意力所涉及的皮质机制。通过将脑磁图和脑电图 (M-EEG) 与解剖 MRI 约束相结合，我们检查了根据空间或音调特征切换听觉注意力所涉及的皮层动力学。我们设计了一个范例，在每次试验开始时提示听众在并发目标和掩蔽流的呈现过程中切换或保持注意力。通过允许听众有时间在连续目标和掩蔽刺激的间隙期间进行切换，我们能够分离出内源性、自上而下的注意力切换所涉及的机制。我们的结果显示，在要求听众根据空间和音调特征切换注意力的任务中，右颞顶交界处（RTPJ）和左下顶叶上边缘部分（LIPSP）的参与之间存在双重分离，这表明根据这些特征切换注意力至少涉及部分独立的过程或行为策略。
Switching attention between different stimuli of interest based on particular task demands is important in many everyday settings. In audition in particular, switching attention between different speakers of interest that are talking concurrently is often necessary for effective communication. Recently, it has been shown by multiple studies that auditory selective attention suppresses the representation of unwanted streams in auditory cortical areas in favor of the target stream of interest. However, the neural processing that guides this selective attention process is not well understood. Here we investigated the cortical mechanisms involved in switching attention based on two different types of auditory features. By combining magneto- and electroencephalography (M-EEG) with an anatomical MRI constraint, we examined the cortical dynamics involved in switching auditory attention based on either spatial or pitch features. We designed a paradigm where listeners were cued in the beginning of each trial to switch or maintain attention halfway through the presentation of concurrent target and masker streams. By allowing listeners time to switch during a gap in the continuous target and masker stimuli, we were able to isolate the mechanisms involved in endogenous, top-down attention switching. Our results show a double dissociation between the involvement of right temporoparietal junction (RTPJ) and the left inferior parietal supramarginal part (LIPSP) in tasks requiring listeners to switch attention based on space and pitch features, respectively, suggesting that switching attention based on these features involves at least partially separate processes or behavioral strategies.
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