Multiple parietal operculum subdivisions in humans: tactile activation maps.
Multiple parietal operculum subdivisions in humans: tactile activation maps.
复制标题
人类中多个顶叶的细分细分：触觉激活图。
DOI：
10.1080/08990220802249275
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发表时间：
2008-09
影响因子：
0.9
通讯作者：
Dierker, Donna L.
中科院分区：
文献类型：
--
作者：
Burton, Harold;Sinclair, Robert J.;Wingert, Jason R.;Dierker, Donna L.
在两组包括振动触觉刺激或在右手食指垫上摩擦不同表面的任务中，我们集中分析了人类后顶盖（PO）的四个结构分支在血氧水平依赖性反应。活动定位于先前定义的顶叶眼窝细分，OP 1-4被共同登记到标准皮质表面图谱。四种振动触觉刺激任务涉及对配对振动参数的关注：(1)在振动频率匹配时检测稀有目标试验；(2)选择频率较高或(3)持续时间较长的振动呈现顺序；(4)在选择刺激顺序之前，将注意力划分为频率和持续时间。表面刺激任务涉及不同表面的各种识别：(1)光滑表面不需要识别。(2)配对水平光栅需要确定粗糙度变化的方向。(3)配对形状需要识别匹配形状和不匹配形状。(4)凸起字母涉及字母识别。结果显示，在人类PO的多个体感觉分支中，有活性，这些分支可能是先前在动物中描述的体感觉区域的同源物。所有任务都激活了OP 1，但在振动触觉任务中，与移动表面任务相比，焦点受到了更大的限制。更大的空间活动范围，特别是在OP 1和OP 4，当手指垫摩擦表面时，不支持先前报道的“S2”中第二个手指表征的躯体解剖。跨OP细分的不同活动分布可能反映了任务之间的低水平感知和/或认知加工差异。
We focused the present analysis on blood oxygen-level dependent responses evoked in four architectonic subdivisions of human posterior parietal operculum (PO) during two groups of tasks involving either vibrotactile stimulation or rubbing different surfaces against the right index finger pad. Activity localized in previously defined parietal opercular subdivisions, OP 1-4 was co-registered to a standard cortical surface-based atlas. Four vibrotactile stimulation tasks involved attention to the parameters of paired vibrations: (1) detect rare target trials when vibration frequencies matched; (2) select the presentation order of the vibration with a higher frequency or (3) longer duration; and (4) divide attention between frequency and duration before selecting stimulus order. Surface stimulation tasks involved various discriminations of different surfaces: (1) Smooth surfaces required no discrimination. (2) Paired horizontal gratings required determination of the direction of roughness change. (3) Paired shapes entailed identifying matched and unmatched shapes. (4) Raised letters involved letter recognition. The results showed activity in multiple somatosensory subdivisions bilaterally in human PO that are plausibly homologues of somatosensory areas previously described in animals. All tasks activated OP 1, but in vibrotactile tasks foci were more restricted compared to moving surface tasks. Greater spatial extents of activity especially in OP 1 and 4 when surfaces rubbed the finger pad did not support previously reported somatotopy of the second finger representation in “S2.” The varied activity distributions across OP subdivisions may reflect low level perceptual and/or cognitive processing differences between tasks.
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