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arXiv 2402.08994cs.CVcs.AI
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CLIP-MUSED:CLIP引导的多被试视觉神经信息语义解码

CLIP-MUSED: CLIP-Guided Multi-Subject Visual Neural Information Semantic Decoding

Institute of Automation, Chinese Academy of Sciences(中国科学院自动化研究所);University of Chinese Academy of Sciences(中国科学院大学)

Qiongyi Zhou, Changde Du, Shengpei Wang, Huiguang He

AI总结:

针对多被试视觉神经信息解码的泛化难题,提出CLIP-MUSED方法,利用Transformer提取全局特征并结合可学习被试token及RSA表征相似性指导,在两个fMRI数据集上达到SOTA。

摘要:

由于个体差异,视觉神经信息解码研究在将单被试解码模型泛化到多被试时面临挑战。此外,单一被试数据的有限可用性对模型性能产生了制约影响。尽管先前的多被试解码方法取得了显著进展,但它们仍存在若干局限性,包括难以提取全局神经响应特征、模型参数随被试数量线性增长,以及对不同被试在各种刺激下的神经响应之间关系的表征不足。为了克服这些局限性,我们提出了一种CLIP引导的多被试视觉神经信息语义解码(CLIP-MUSED)方法。我们的方法包含一个基于Transformer的特征提取器,以有效地对全局神经表征进行建模。它还结合了可学习的被试特定token,这促进了多被试数据的聚合而无需参数的线性增加。此外,我们采用表征相似性分析(RSA)基于CLIP表征空间中视觉刺激的拓扑关系来指导token表征学习,从而能够充分表征不同被试在不同刺激下的神经响应之间的关系。最后,token表征被用于多被试语义解码。我们提出的方法优于单被试解码方法,并在两个fMRI数据集上在现有的多被试方法中实现了最先进的性能。可视化结果为我们提出方法的有效性提供了深刻见解。代码可在https://github.com/CLIP-MUSED/CLIP-MUSED获取。

英文摘要:

The study of decoding visual neural information faces challenges in generalizing single-subject decoding models to multiple subjects, due to individual differences. Moreover, the limited availability of data from a single subject has a constraining impact on model performance. Although prior multi-subject decoding methods have made significant progress, they still suffer from several limitations, including difficulty in extracting global neural response features, linear scaling of model parameters with the number of subjects, and inadequate characterization of the relationship between neural responses of different subjects to various stimuli. To overcome these limitations, we propose a CLIP-guided Multi-sUbject visual neural information SEmantic Decoding (CLIP-MUSED) method. Our method consists of a Transformer-based feature extractor to effectively model global neural representations. It also incorporates learnable subject-specific tokens that facilitates the aggregation of multi-subject data without a linear increase of parameters. Additionally, we employ representational similarity analysis (RSA) to guide token representation learning based on the topological relationship of visual stimuli in the representation space of CLIP, enabling full characterization of the relationship between neural responses of different subjects under different stimuli. Finally, token representations are used for multi-subject semantic decoding. Our proposed method outperforms single-subject decoding methods and achieves state-of-the-art performance among the existing multi-subject methods on two fMRI datasets. Visualization results provide insights into the effectiveness of our proposed method. Code is available at https://github.com/CLIP-MUSED/CLIP-MUSED.

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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