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超越身体地图:特定身体部位的信息内容分布在躯体感觉小人上。

Beyond body maps: Information content of specific body parts is distributed across the somatosensory homunculus.

机构信息

Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AZ, UK.

Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AZ, UK; Wellcome Centre of Integrative Neuroimaging, University of Oxford, Oxford OX3 9DU, UK.

出版信息

Cell Rep. 2022 Mar 15;38(11):110523. doi: 10.1016/j.celrep.2022.110523.

Abstract

The homunculus in primary somatosensory cortex (S1) is famous for its body part selectivity, but this dominant feature may eclipse other representational features, e.g., information content, also relevant for S1 organization. Using multivariate fMRI analysis, we ask whether body part information content can be identified in S1 beyond its primary region. Throughout S1, we identify significant representational dissimilarities between body parts but also subparts in distant non-primary regions (e.g., between the hand and the lips in the foot region and between different face parts in the foot region). Two movements performed by one body part (e.g., the hand) could also be dissociated well beyond its primary region (e.g., in the foot and face regions), even within Brodmann area 3b. Our results demonstrate that information content is more distributed across S1 than selectivity maps suggest. This finding reveals underlying information contents in S1 that could be harnessed for rehabilitation and brain-machine interfaces.

摘要

初级体感皮层(S1)中的小人图以其身体部位的选择性而闻名,但这种主要特征可能会掩盖其他表示特征,例如,与 S1 组织也相关的信息内容。我们使用多元 fMRI 分析来询问,除了主要区域之外,是否可以在 S1 中识别身体部位的信息内容。在整个 S1 中,我们发现身体部位之间存在显著的表示差异,但在遥远的非主要区域(例如,足部区域中手和嘴唇之间,足部区域中不同面部部位之间)也存在差异。同一身体部位执行的两个动作(例如手)也可以很好地区分,甚至在布罗德曼 3b 区之外(例如在足部和面部区域)。我们的结果表明,信息内容在 S1 中的分布比选择性图所表明的更为广泛。这一发现揭示了 S1 中的潜在信息内容,这些内容可用于康复和脑机接口。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/37bc/8938902/40622b98e095/fx1.jpg

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