Eye Movements during Auditory Attention Predict Individual Differences in Dorsal Attention Network Activity.
Eye Movements during Auditory Attention Predict Individual Differences in Dorsal Attention Network Activity.
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DOI：
10.3389/fnhum.2016.00164
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发表时间：
2016
影响因子：
2.9
通讯作者：
Leech R
中科院分区：
文献类型：
--
作者：
Braga RM;Fu RZ;Seemungal BM;Wise RJ;Leech R
支持听觉注意的神经机制尚未完全了解。一个背侧额顶叶脑区网络被认为是在所有感觉方式中调节注意力的空间定向。这个网络的关键部分，额叶眼区（FEF）和上级顶叶（SPL），包含视网膜定位图，并在刺激时引起扫视。这表明它们在听觉注意过程中的募集可能反映了跨模态眼动过程;然而，这尚未得到实验证实。在这里，我们调查是否任务诱发的眼睛运动在听觉任务可以预测的活动幅度内的背额顶叶网络。一个空间和非空间的听力任务，使用在线眼动跟踪和功能磁共振成像（fMRI）。没有使用视觉刺激或线索。听觉任务引起系统的眼球运动，眼跳率和注视位置预测的注意参与和提示的声音位置，分别。与SPL和FEF之间分离的诱发眼运动的这些单独方面相关的活动。然而，这些观察到的眼球运动不能解释所有的激活额顶叶网络。我们的研究结果表明，招聘的SPL和FEF在注意听反映，至少部分地，在非视觉注意过程中，公开的跨模态oculabetics过程。需要进一步的工作来确定网络对听觉注意力的剩余贡献是通过隐蔽的跨模态过程，还是直接参与听觉信息的操纵。
The neural mechanisms supporting auditory attention are not fully understood. A dorsal frontoparietal network of brain regions is thought to mediate the spatial orienting of attention across all sensory modalities. Key parts of this network, the frontal eye fields (FEF) and the superior parietal lobes (SPL), contain retinotopic maps and elicit saccades when stimulated. This suggests that their recruitment during auditory attention might reflect crossmodal oculomotor processes; however this has not been confirmed experimentally. Here we investigate whether task-evoked eye movements during an auditory task can predict the magnitude of activity within the dorsal frontoparietal network. A spatial and non-spatial listening task was used with on-line eye-tracking and functional magnetic resonance imaging (fMRI). No visual stimuli or cues were used. The auditory task elicited systematic eye movements, with saccade rate and gaze position predicting attentional engagement and the cued sound location, respectively. Activity associated with these separate aspects of evoked eye-movements dissociated between the SPL and FEF. However these observed eye movements could not account for all the activation in the frontoparietal network. Our results suggest that the recruitment of the SPL and FEF during attentive listening reflects, at least partly, overt crossmodal oculomotor processes during non-visual attention. Further work is needed to establish whether the network’s remaining contribution to auditory attention is through covert crossmodal processes, or is directly involved in the manipulation of auditory information.