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Cortical Representation of Tactile Stickiness Evoked by Skin Contact and Glove Contact.
Frontiers in Integrative Neuroscience ( IF 2.6 ) Pub Date : 2020-03-23 , DOI: 10.3389/fnint.2020.00019
Junsuk Kim 1, 2 , Isabelle Bülthoff 1 , Heinrich H Bülthoff 1
Affiliation  

Even when we are wearing gloves, we can easily detect whether a surface that we are touching is sticky or not. However, we know little about the similarities between brain activations elicited by this glove contact and by direct contact with our bare skin. In this functional magnetic resonance imaging (fMRI) study, we investigated which brain regions represent stickiness intensity information obtained in both touch conditions, i.e., skin contact and glove contact. First, we searched for neural representations mediating stickiness for each touch condition separately and found regions responding to both mainly in the supramarginal gyrus and the secondary somatosensory cortex. Second, we explored whether surface stickiness is encoded in common neural patterns irrespective of how participants touched the sticky stimuli. Using a cross-condition decoding method, we tested whether the stickiness intensities could be decoded from fMRI signals evoked by skin contact using a classifier trained on the responses elicited by glove contact, and vice versa. Our results found shared neural encoding patterns in the bilateral angular gyri and the inferior frontal gyrus (IFG) and suggest that these areas represent stickiness intensity information regardless of how participants touched the sticky stimuli. Interestingly, we observed that neural encoding patterns of these areas were reflected in participants’ intensity ratings. This study revealed common and distinct brain activation patterns of tactile stickiness using two different touch conditions, which may broaden the understanding of neural mechanisms related to surface texture perception.



中文翻译:

皮肤接触和手套接触引起的触觉粘性的皮质表示。

即使戴着手套,我们也可以轻松检测出我们接触的表面是否发粘。但是,我们对这种手套接触和直接接触裸露皮肤引起的大脑激活之间的相似性知之甚少。在这项功能磁共振成像(fMRI)研究中,我们调查了哪个大脑区域代表在两种接触条件下(即皮肤接触和手套接触)获得的粘性强度信息。首先,我们分别搜索了介导每个触摸条件的黏性的神经表示,并发现了主要在上颌回和次生体感皮层中都响应的区域。其次,我们探讨了表面粘性是否以常见的神经模式编码,而与参与者如何触摸粘性刺激无关。使用交叉条件解码方法,我们测试了是否可以使用对手套接触引起的反应进行训练的分类器,从由皮肤接触引起的fMRI信号中解码粘性强度,反之亦然。我们的研究结果发现在双侧角回和下额回(IFG)中存在共享的神经编码模式,并且表明这些区域代表粘性强度信息,而不管参与者如何接触粘性刺激。有趣的是,我们观察到这些区域的神经编码模式反映在参与者的强度等级中。这项研究揭示了使用两种不同的接触条件,触觉粘性的共同而独特的大脑激活模式,这可能拓宽了与表面纹理感知相关的神经机制的理解。我们测试了使用分类器训练的分类器是否可以从皮肤接触引起的功能磁共振成像信号中解码粘性强度,反之亦然。我们的研究结果发现在双侧角回和下额回(IFG)中存在共享的神经编码模式,并且表明这些区域代表粘性强度信息,而不管参与者如何接触粘性刺激。有趣的是,我们观察到这些区域的神经编码模式反映在参与者的强度等级中。这项研究揭示了使用两种不同的接触条件,触觉粘性的共同而独特的大脑激活模式,这可能拓宽了与表面纹理感知相关的神经机制的理解。我们测试了使用分类器训练的分类器是否可以从皮肤接触引起的功能磁共振成像信号中解码粘性强度,反之亦然。我们的研究结果发现在双侧角回和下额回(IFG)中存在共享的神经编码模式,并且表明这些区域代表粘性强度信息,而不管参与者如何接触粘性刺激。有趣的是,我们观察到这些区域的神经编码模式反映在参与者的强度等级中。这项研究揭示了使用两种不同的接触条件,触觉粘性的共同而独特的大脑激活模式,这可能拓宽了与表面纹理感知相关的神经机制的理解。

更新日期:2020-03-23
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