Crossmodal Influences in Somatosensory Cortex: Interaction of Vision and Touch
Crossmodal Influences in Somatosensory Cortex: Interaction of Vision and Touch
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DOI：
10.1002/hbm.20841
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发表时间：
2010-01-01
影响因子：
4.8
通讯作者：
Staines, W. Richard
中科院分区：
文献类型：
--
作者：
Dionne, Jennifer K.;Meehan, Sean K.;Staines, W. Richard
先前的研究表明，来自一种感觉通道的信息有可能影响不同通道的活动，这些跨通道交互作用可以发生在感觉特定皮质内的皮质感觉加工流的早期。此外，已有研究表明，当感觉信息与任务表现相关时，感觉皮层会上调。本研究旨在探讨双峰(视觉和振动触觉)同时刺激对初级躯体感觉皮层(SI)调制的影响，在这两种刺激都与任务相关的延迟感觉-运动任务的背景下。有人假设，与单独使用振动触觉刺激相比，组合视觉和振动触觉刺激的要求将与SI活动的增加相关。使用3T扫描仪对健康受试者进行功能磁共振成像(FMRI)。在扫描过程中，受试者在接受视觉、振动触觉或两种类型的刺激的同时，执行感觉引导的运动任务。使用与事件相关的设计来检查与刺激开始和运动反应相关的皮质活动。对右侧SI进行感兴趣区(ROI)分析，发现与单峰任务相比，双峰(视觉+触觉)任务中依赖血氧水平的信号变化百分比增加。全脑分析的结果显示，一个共同的额顶网络在双峰和单峰任务条件下都很活跃，这表明这些区域对任务的注意力和运动规划方面比较敏感，而不是对刺激的单峰或双峰性质敏感。《哼唱大脑地图》31：14-25,2010。(C)2009年Wiley-Liss，Inc.
Previous research has shown that information from one sensory modality has the potential to influence activity in a different modality, and these crossmodal interactions can occur early in the cortical sensory processing stream within sensory-specific cortex. In addition, it has been shown that when sensory information is relevant to the performance of a task, there is an upregulation of sensory cortex. This study sought to investigate the effects of simultaneous bimodal (visual and vibrotactile) stimulation on the modulation of primary somatosensory cortex (SI), in the context of a delayed sensory-to-motor task when both stimuli are task-relevant. It was hypothesized that the requirement to combine visual and vibrotactile stimuli would be associated with an increase in SI activity compared to vibrotactile stimuli alone. Functional magnetic resonance imaging (fMRI) was performed on healthy subjects using a 3T scanner. During the scanning session, subjects performed a sensory-guided motor task while receiving visual, vibrotactile, or both types of stimuli. An event-related design was used to examine cortical activity related to the stimulus onset and the motor response. A region of interest (ROI) analysis was performed on right SI and revealed an increase in percent blood oxygenation level dependent signal change in the bimodal (visual + tactile) task compared to the unimodal tasks. Results of the whole-brain analysis revealed a common fronto-parietal network that was active across both the bimodal and unimodal task conditions, suggesting that these regions are sensitive to the attentional and motor-planning aspects of the task rather than the unimodal or bimodal nature of the stimuli. Hum Brain Mapp 31:14-25,2010. (C) 2009 Wiley-Liss, Inc.