Cross-Modal Attention Effects in the Vestibular Cortex during Attentive Tracking of Moving Objects
Cross-Modal Attention Effects in the Vestibular Cortex during Attentive Tracking of Moving Objects
复制标题
DOI：
10.1523/jneurosci.2480-16.2016
复制
发表时间：
2016-12-14
影响因子：
5.3
通讯作者：
Greenlee, Mark W.
中科院分区：
文献类型：
--
作者：
Frank, Sebastian M.;Sun, Liwei;Greenlee, Mark W.
大脑侧裂的中后部基底是前庭线索的皮质处理的中心。在这个部位至少有两个前庭区域：顶叶岛前庭皮质（PIVC）和后岛皮质（PIC）。现在已经确定，感觉系统的活动受到跨通道注意力效应的影响。注意一种感觉方式的刺激会增强相应皮层感觉系统的活动，但同时会抑制其他感觉系统的活动。在这里，我们想探讨这种跨通道注意力效应是否也针对前庭系统。为此，我们使用了视觉多目标跟踪任务。通过参数化地改变跟踪目标的数量，我们可以测量注意负荷对PIVC和PIC的影响，同时保持知觉负荷恒定。参与者在功能性磁共振成像期间执行跟踪任务。结果表明，与被动观察的对象运动，活动过程中的对象跟踪被抑制在PIVC和增强在PIC。更大的注意力负荷，通过增加跟踪目标的数量，与相应的增加抑制活动的PIVC。在PIC的前部的活动随着负荷的增加而减少，而负荷的影响是不存在的后部PIC。控制实验的结果表明，注意诱导的抑制在PIVC比任何抑制诱发的视觉刺激本身。总体而言，我们的研究结果表明，在视觉对象跟踪过程中，注意力对前庭皮层具有跨模态调制作用。
The midposterior fundus of the Sylvian fissure in the human brain is central to the cortical processing of vestibular cues. At least two vestibular areas are located at this site: the parietoinsular vestibular cortex (PIVC) and the posterior insular cortex (PIC). It is now well established that activity in sensory systems is subject to cross-modal attention effects. Attending to a stimulus in one sensory modality enhances activity in the corresponding cortical sensory system, but simultaneously suppresses activity in other sensory systems. Here, we wanted to probe whether such cross-modal attention effects also target the vestibular system. To this end, weused a visual multiple-object tracking task. By parametrically varying the number of tracked targets, we could measure the effect of attentional load on the PIVC and the PIC while holding the perceptual load constant. Participants performed the tracking task during functional magnetic resonance imaging. Results show that, compared with passive viewing of object motion, activity during object tracking was suppressed in the PIVC and enhanced in the PIC. Greater attentional load, induced by increasing the number of tracked targets, was associated with a corresponding increase in the suppression of activity in the PIVC. Activity in the anterior part of the PIC decreased with increasing load, whereas load effects were absent in the posterior PIC. Results of a control experiment show that attention-induced suppression in the PIVC is stronger than any suppression evoked by the visual stimulus per se. Overall, our results suggest that attention has a cross-modal modulatory effect on the vestibular cortex during visual object tracking.