Somatosensory evoked field in response to visuotactile stimulation in 3- to 4-year-old children.
Somatosensory evoked field in response to visuotactile stimulation in 3- to 4-year-old children.
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DOI：
10.3389/fnhum.2014.00170
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发表时间：
2014
影响因子：
2.9
通讯作者：
Minabe Y
中科院分区：
文献类型：
--
作者：
Remijn GB;Kikuchi M;Shitamichi K;Ueno S;Yoshimura Y;Nagao K;Tsubokawa T;Kojima H;Higashida H;Minabe Y
采用儿童专用脑磁图系统对3 ~ 4岁儿童的体感诱发场（SEF）进行研究。三种刺激条件被使用，其中儿童只接受左手食指刺激或视觉触觉刺激。在这两种视觉触觉条件下，孩子们在观看触觉刺激视频时接受手指的触觉刺激，触觉刺激要么施加在别人的手指上（手指触摸条件），要么施加在别人的脚趾上（脚趾触摸条件）。分析对侧（右侧）躯体感觉皮层的等效电流偶极子（ECD）的激发强度和源极强度。在学龄前儿童谁提供了有效的ECD，刺激条件引起的早期潜伏期ECD发生在60和68毫秒之间，主要是与前的方向。我们进一步确定了97和104毫秒之间的中潜伏期ECD，主要有一个向后的方向。最后，最初的证据被发现为晚潜伏期ECD在约139-151毫秒再次更经常与前向。不同刺激条件下，中潜伏期ECDs的源强度存在差异。对于可以形成的配对比较，ECD源强度在手指触摸条件下比在仅抓握和脚趾触摸条件下更明显。虽然需要更多的研究来扩大数据集，但这表明视觉信息调制了学龄前SEF。与不同身体部位相比，当看到和感觉到触摸发生在同一身体部位时，ECD源强度更高，这一发现可能进一步表明视觉和触觉信息之间的连接在学龄前体感皮层活动中被索引，已经以躯体定位的方式。
A child-customized magnetoencephalography system was used to investigate somatosensory evoked field (SEF) in 3- to 4-year-old children. Three stimulus conditions were used in which the children received tactile-only stimulation to their left index finger or visuotactile stimulation. In the two visuotactile conditions, the children received tactile stimulation to their finger while they watched a video of tactile stimulation applied either to someone else’s finger (the finger-touch condition) or to someone else’s toe (the toe-touch condition). The latencies and source strengths of equivalent current dipoles (ECDs) over contralateral (right) somatosensory cortex were analyzed. In the preschoolers who provided valid ECDs, the stimulus conditions induced an early-latency ECD occurring between 60 and 68 ms mainly with an anterior direction. We further identified a middle-latency ECD between 97 and 104 ms, which predominantly had a posterior direction. Finally, initial evidence was found for a late-latency ECD at about 139–151 ms again more often with an anterior direction. Differences were found in the source strengths of the middle-latency ECDs among the stimulus conditions. For the paired comparisons that could be formed, ECD source strength was more pronounced in the finger-touch condition than in the tactile-only and the toe-touch conditions. Although more research is necessary to expand the data set, this suggests that visual information modulated preschool SEF. The finding that ECD source strength was higher when seen and felt touch occurred to the same body part, as compared to a different body part, might further indicate that connectivity between visual and tactile information is indexed in preschool somatosensory cortical activity, already in a somatotopic way.
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