Eye Movements as Images: A Multimodal Framework for Eye Movements Representation

Eye movements are increasingly popular for enhancing natural language processing and modeling individual states. Although specialized methods have been developed to represent eye movements for various tasks, effectively modeling the complex dynamics of eye movements and the heterogeneity with stimulus text remains challenging. This paper proposes a text-guided eye movement representation framework that introduces a novel perspective by converting raw eye movement sequences into line graph images and encoding them with a powerful pre-trained vision transformer. To address the disparities between eye movements and text, we guide their temporal alignment using human reading order and combine Canonical Correlation Analysis with Optimal Transport to fuse the two modalities. This approach not only significantly simplifies the design of specialized models but also has the potential to become a universal representation for eye movements. Experimental results on six different domain tasks show that the proposed method achieves state-of-the-art performance. We release the source code at https://github.com/wulalahalala/VLEM.