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arXiv 2406.14481cs.LGcs.AIcs.NEq-bio.NC
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利用多模态网络揭示大脑中的视觉-语言整合机制

Revealing Vision-Language Integration in the Brain with Multimodal Networks

MIT CSAIL(麻省理工学院计算机科学与人工智能实验室);CBMM(计算与记忆研究中心);Johns Hopkins University(约翰斯·霍普金斯大学);Boston Children’s Hospital(波士顿儿童医院);Harvard Medical School(哈佛医学院)

Vighnesh Subramaniam, Colin Conwell, Christopher Wang, Gabriel Kreiman, Boris Katz, Ignacio Cases, Andrei Barbu

AI总结:

该研究利用多模态深度神经网络预测人脑SEEG信号,通过对照不同模态模型的预测表现,定位出大脑中12.94%的多模态视觉-语言整合位点,并发现CLIP风格训练最适配这类神经活动预测。

摘要:

我们使用(多)模态深度神经网络(DNNs),通过预测人类受试者观看电影时的立体脑电图(SEEG)记录,来探测人类大脑中的多模态整合位点。我们将多模态整合位点定义为:多模态视觉-语言模型对脑电记录的预测效果优于单模态语言模型、单模态视觉模型或线性整合的语言-视觉模型的脑区。我们的目标DNN模型涵盖不同架构(例如卷积网络和transformer)以及多种多模态训练技术(例如交叉注意力和对比学习)。作为一项关键的支撑性步骤,我们首先证明,经过训练的视觉和语言模型在预测SEEG信号的能力上,系统性地优于其随机初始化的对应版本。随后我们将单模态模型与多模态模型进行相互比较。由于我们的目标DNN模型通常在架构、参数量和训练集上存在差异(可能会掩盖由整合机制导致的性能差异),我们对两个模型(SLIP和SimCLR)开展了对照比较——这两个模型除输入模态外,所有上述属性均保持一致。通过该方法,我们识别出大量存在多模态整合迹象的神经位点(平均在1090个总位点中占141个,即12.94%)及对应脑区。此外我们发现,在我们评估的多种多模态训练技术变体中,CLIP风格的训练最适合用于下游的这些位点神经活动预测任务。

英文摘要:

We use (multi)modal deep neural networks (DNNs) to probe for sites of multimodal integration in the human brain by predicting stereoencephalography (SEEG) recordings taken while human subjects watched movies. We operationalize sites of multimodal integration as regions where a multimodal vision-language model predicts recordings better than unimodal language, unimodal vision, or linearly-integrated language-vision models. Our target DNN models span different architectures (e.g., convolutional networks and transformers) and multimodal training techniques (e.g., cross-attention and contrastive learning). As a key enabling step, we first demonstrate that trained vision and language models systematically outperform their randomly initialized counterparts in their ability to predict SEEG signals. We then compare unimodal and multimodal models against one another. Because our target DNN models often have different architectures, number of parameters, and training sets (possibly obscuring those differences attributable to integration), we carry out a controlled comparison of two models (SLIP and SimCLR), which keep all of these attributes the same aside from input modality. Using this approach, we identify a sizable number of neural sites (on average 141 out of 1090 total sites or 12.94%) and brain regions where multimodal integration seems to occur. Additionally, we find that among the variants of multimodal training techniques we assess, CLIP-style training is the best suited for downstream prediction of the neural activity in these sites.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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