Neural pathways in tactile object recognition
Neural pathways in tactile object recognition
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DOI：
10.1212/wnl.52.7.1413
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发表时间：
1999-04-22
期刊：
影响因子：
9.9
通讯作者：
Hart, J
中科院分区：
文献类型：
--
作者：
Deibert, E;Kraut, M;Hart, J
目的：利用功能磁共振成像（fMRI）技术进一步明确触觉物体识别的脑区。背景：触觉物体识别（TOR）的神经基质尚未阐明。对非人类灵长类动物和人类的研究表明，基本的运动和体感机制涉及外周水平;然而，高阶物体识别的机制尚未确定。方法：采用功能磁共振成像技术对11名正常志愿者进行研究，试图确定TOR的神经通路。每个人都进行了一个行为范式与激活条件涉及识别对象的触摸，识别粗糙/光滑的控制。结果如下：数据表明，在大多数人，TOR涉及的距状核和纹状体外皮质，顶下小叶，额下回，和上级额回极区。结论：TOR可以利用视觉系统来访问内部对象表征，顶叶皮层和下额叶区域可以参与命名被检查对象的伴随词汇策略。额极激活可能在视觉空间工作记忆或识别物体的不寻常表征中发挥作用。总的来说，这些发现表明，TOR可能涉及一个皮层区域的网络，这些区域辅助躯体感觉、运动、视觉，有时还包括词汇处理。初步发现表明，在这个正常的研究人群中，视觉皮层可能参与地形空间处理的TOR。
Objective: To define further the brain regions involved in tactile object recognition using functional MRI (fMRI) techniques. Background: The neural substrates involved in tactile object recognition (TOR) have not been elucidated. Studies of nonhuman primates and humans suggest that basic motor and somatosensory mechanisms are involved at a peripheral level; however, the mechanisms of higher order object recognition have not been determined. Methods: The authors investigated 11 normal volunteers utilizing fMRI techniques in an attempt to determine the neural pathways involved in TOR. Each individual performed a behavioral paradigm with the activated condition involving identification of objects by touch, with identification of rough/smooth as the control. Results: Data suggest that in a majority of individuals, TOR involves the calcarine and extrastriatal cortex, inferior parietal lobule, inferior frontal gyrus, and superior frontal gyrus-polar region. Conclusions: TOR may utilize visual systems to access an internal object representation, The parietal cortices and inferior frontal regions may be involved in a concomitant lexical strategy of naming the object being examined. Frontal polar activation likely serves a role in visuospatial working memory or in recognizing unusual representations of objects. Overall, these findings suggest that TOR could involve a network of cortical regions subserving somatosensory, motor, visual, and, at times,lexical processing. The primary finding suggests that in this normal study population, the visual cortices may be involved in the topographic spatial processing of TOR.