Tactile attention tasks enhance activation in somatosensory regions of parietal cortex: A positron emission tomography study
Tactile attention tasks enhance activation in somatosensory regions of parietal cortex: A positron emission tomography study
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DOI：
10.1093/cercor/9.7.662
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发表时间：
1999-10-01
期刊：
影响因子：
3.7
通讯作者：
Raichle, ME
中科院分区：
文献类型：
--
作者：
Burton, H;Abend, NS;Raichle, ME
我们使用正电子发射断层扫描研究皮质区域介导触觉注意。线索选择性地引导受试者注意与压纹光栅接触的粗糙度或持续时间，这些压纹光栅以受控的速度和力量摩擦单个指尖。这项任务需要区分在粗糙度和/或长度的触觉特征上不同的成对光栅。在不同的实验块中，线索将注意力引导到一个触觉特征上，或者指示对任何一个特征的变化的分散注意力策略。所有的注意条件都明确地激活了顶叶皮层的几个体感灶，包括中央后回（S1）中初级体感皮层的体位适宜部分和顶叶眼区的次级体感区（S2）。没有证据表明选择性和分裂注意策略有单独的加工焦点，也没有证据表明选择性地关注粗糙度和刺激持续时间。在注意任务中，我们观察到S2的血流量比S1的血流量变化更大，这表明S2可能实际上影响S1的活动。尽管存在这些差异，S1和S2的调节支持了触觉注意早期选择的概念。在额叶皮质、前扣带回和双侧上顶叶中央后沟底也有非感觉病灶。本研究中观察到的后顶叶区域在视觉注意研究中没有重叠。因此，后顶叶区域可以被细分为特定模态的子区域，每个子区域处理处理特定模态所需的信息。这些非感觉区域可能构成一个网络，为早期阶段的感觉区域提供调节影响的来源。
We used positron emission tomography to study cortical regions mediating tactile attention. Cues selectively directed subjects to attend to the roughness or duration of contact with embossed gratings that rubbed against a single fingertip with controlled speed and force. The task required discriminating between paired gratings that differed in tactile features of roughness and/or length. For different blocks of trials, cues directed attention to one tactile feature or indicated a divided attention strategy to a change in either feature. All attention conditions unambiguously activated several somatosensory foci in the parietal cortex, including somatotopically appropriate portions of the primary somatosensory cortex in the postcentral gyrus (S1) and the secondary somatosensory region (S2) within parietal opercular regions. There was no evidence for separate processing foci for selective and divided attention strategies, or for selectively attending to roughness versus stimulus duration. We observed a greater magnitude blood flow change in S2 versus S1 during attention tasks, which suggests that S2 might actually influence S1 activity. Despite these differences, modulation of S1 and S2 supports concepts of early selection in tactile attention. There were also examples of non-sensory foci in frontal cortex, anterior cingulate gyrus and bilateral superior parietal regions at the fundus of the postcentral sulcus. Posterior parietal regions observed in this study did not overlap foci seen in studies of visual attention. Thus, the posterior parietal region may he subdivided into modality-specific subregions, each of which processes information needed to attend to a specific modality. These non-sensory areas may constitute a network that provides a source of modulating influences on the earlier stage, sensory areas.