发表机构
Somach Systems, Inc.（索马赫系统公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过容积导体模型计算发音器官到电极的耦合，发现五个关键发音器官稳健偏好下颌导联，耳后导联不可靠，但按解剖目标放置的四位点簇可提升性能最多1.07 dB。
AI 中文摘要
目标。耳戴式生物电位设备的设计围绕一种尚未计算的耦合进行：每个言语发音器官在多大程度上到达下颌和耳周围的电极。我们计算了这种耦合，并针对可能产生虚假结果的三个因素——源方向、电极数量以及容积导体中解剖细节的水平——对答案进行了检验。方法。通过互易性在MIDA（一个具有116个标记隔室、分辨率为500微米的头部模型）上计算发音器官到电极的耦合，将肌肉同时视为发生器及其自身的导电隔室。将22个电极位置——涵盖标准下颌导联、耳后簇和cEEGrid C路径——与十个单独分割的发音器官进行比较。源方向在整个半球上扫描，而非假定，并且每次比较都在匹配的电极数量下重复进行。结果。五个发音器官——口轮匝肌、颊肌、颏肌、降口角肌和颈阔肌——在每一个采样方向和每一个电极子样本中都偏好下颌导联。没有肌肉稳健地偏好耳后导联。最倾向于耳朵的候选者颞肌，在均匀方向扫描下达到-2.57 dB；但根据标签体积推导，其纤维场给出-1.15 dB，区间为[-1.45, +5.46]，并且只有一半的四位点耳后子集偏好耳朵。意义。对于设备设计而言，结果是单方面的，而非权衡：耳后导联完全丢失嘴唇和下巴的活动，并且不能可靠地换回任何肌肉。仍然作为设计杠杆的是放置位置——根据解剖目标选择的四位点簇比耳周围任意放置最多高出1.07 dB。
英文摘要
Objective. We compared how strongly speech-muscle sources couple to electrodes on the jaw and around the ear, and tested sensitivity to source orientation, electrode count, and anatomical detail. Approach. Using reciprocity in MIDA (116 labelled compartments, 500 micrometres), we evaluated 22 electrode positions against ten segmented articulators. Muscle was modelled as both source and conducting tissue. Comparisons used equal electrode counts and a hemisphere orientation sweep, with anatomy-derived fibre models for temporalis and lateral pterygoid. Results. Orbicularis oris, buccinator, mentalis, depressor anguli oris, and platysma favoured the jaw at every sampled orientation and tested electrode subset. Temporalis showed a 2.57 dB ear advantage under the uniform sweep, reduced to 1.15 dB with the derived fibre field. Its jaw-minus-ear interval [-1.45, +5.46] dB crossed zero; 50.5% of four-site ear subsets favoured the ear. The derived lateral-pterygoid interval [-5.33, -1.12] dB favoured the ear at the fixed jaw basis. Both derived constructions have unresolved anatomical limitations. Simplifying non-muscle soft-tissue conductivities preserved montage assignments while changing gaps by up to 3.27 dB. Significance. In this head model, jaw placement better captures lip and chin activity. Ear-side preferences depend on source assumptions and electrode selection. Targeted four-site placement improved lateral-pterygoid coupling by 1.07 dB over the median random ear montage. These coupling predictions require experimental testing.
CommentsRevised title, abstract and text. Reported both derived fibre models; clarified protocol history and current-normalization limits. Added a graphical abstract, 116 conductivity rows and a volume-only Supplementary Figure S1. Existing numerical results and numbered figure assets are unchanged. Code: https://github.com/Somach-Systems-Inc/ear-emg-forward-model
