论文标题
人类大脑活动的多标签多标签细颗粒情绪解码
Multi-view Multi-label Fine-grained Emotion Decoding from Human Brain Activity
论文作者
论文摘要
从人脑活动中解码情绪状态在脑部计算机界面中起着重要作用。现有的情绪解码方法仍然有两个主要局限性:一个只是从大脑活动模式中解码单个情绪类别,而解码的情绪类别则是粗粒的,这与人类的复杂情绪表达不一致;另一个是忽略人脑左右半球之间情绪表达的差异。在本文中,我们提出了一种新型的多视图多标签混合模型,用于细粒度的情感解码(多达80个情感类别),该模型可以学习表达性的神经表示并同时预测多个情绪状态。具体而言,混合模型的生成成分通过多视图变异自动编码器进行了参数化,其中我们认为左和右半球的大脑活动及其差异是三种不同的观点,并在其推理网络中使用专家机制的产物。我们混合模型的区分成分是通过具有不对称局灶性损失的多标签分类网络实现的。为了进行更准确的情绪解码,我们首先采用了一种标签感知模块,以进行特定于情绪的神经表现力学习,然后通过掩盖的自我注意解机制对情绪状态的依赖进行建模。对两个视觉唤起的情绪数据集进行了广泛的实验,显示了我们方法的优越性。
Decoding emotional states from human brain activity plays an important role in brain-computer interfaces. Existing emotion decoding methods still have two main limitations: one is only decoding a single emotion category from a brain activity pattern and the decoded emotion categories are coarse-grained, which is inconsistent with the complex emotional expression of human; the other is ignoring the discrepancy of emotion expression between the left and right hemispheres of human brain. In this paper, we propose a novel multi-view multi-label hybrid model for fine-grained emotion decoding (up to 80 emotion categories) which can learn the expressive neural representations and predicting multiple emotional states simultaneously. Specifically, the generative component of our hybrid model is parametrized by a multi-view variational auto-encoder, in which we regard the brain activity of left and right hemispheres and their difference as three distinct views, and use the product of expert mechanism in its inference network. The discriminative component of our hybrid model is implemented by a multi-label classification network with an asymmetric focal loss. For more accurate emotion decoding, we first adopt a label-aware module for emotion-specific neural representations learning and then model the dependency of emotional states by a masked self-attention mechanism. Extensive experiments on two visually evoked emotional datasets show the superiority of our method.