Neural mechanisms of selective attention in the somatosensory system
Neural mechanisms of selective attention in the somatosensory system
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DOI：
10.1152/jn.00637.2015
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发表时间：
2016-09-01
影响因子：
2.5
通讯作者：
Niebur, Ernst
中科院分区：
文献类型：
--
作者：
Gomez-Ramirez, Manuel;Hysaj, Kristjana;Niebur, Ernst
选择性注意允许生物体提取与行为相关的信息，同时忽略那些争夺其中枢神经系统有限资源的分散注意力的刺激。注意力高度灵活，可以利用它来根据感觉模态、模态内特征、空间位置、对象身份和/或时间属性选择信息。在这篇综述中，我们讨论了身体的工作，致力于了解身体感觉系统中的选择性注意机制。特别是，我们描述了注意力对触觉行为和相应的体感皮层神经活动的影响。我们的重点是神经机制，选择触觉刺激的基础上，他们在身体上的位置（基于躯体的注意）或他们的感觉特征（基于特征的注意）。我们强调触摸和其他感觉系统的选择机制之间的相似之处，并讨论了几个假定的神经编码方案皮质人口信号的行为相关的感觉输入。具体来说，我们对比的优点和缺点，使用增益与尖峰尖峰相关代码代表出席感官刺激。我们赞成触觉注意的神经网络模型，它由额叶、顶叶和皮层下区域组成，控制体感细胞编码相关的刺激特征，使整个体感层次的优先处理。我们的综述是基于人类的非侵入性电生理和成像数据以及非人类灵长类动物的单单位记录数据。
Selective attention allows organisms to extract behaviorally relevant information while ignoring distracting stimuli that compete for the limited resources of their central nervous systems. Attention is highly flexible, and it can be harnessed to select information based on sensory modality, within-modality feature(s), spatial location, object identity, and/or temporal properties. In this review, we discuss the body of work devoted to understanding mechanisms of selective attention in the somatosensory system. In particular, we describe the effects of attention on tactile behavior and corresponding neural activity in somatosensory cortex. Our focus is on neural mechanisms that select tactile stimuli based on their location on the body (somatotopic-based attention) or their sensory feature (feature-based attention). We highlight parallels between selection mechanisms in touch and other sensory systems and discuss several putative neural coding schemes employed by cortical populations to signal the behavioral relevance of sensory inputs. Specifically, we contrast the advantages and disadvantages of using a gain vs. spike-spike correlation code for representing attended sensory stimuli. We favor a neural network model of tactile attention that is composed of frontal, parietal, and subcortical areas that controls somatosensory cells encoding the relevant stimulus features to enable preferential processing throughout the somatosensory hierarchy. Our review is based on data from noninvasive electrophysiological and imaging data in humans as well as single-unit recordings in nonhuman primates.