2026/01/28 by Kamrul Hasan, Oleg V. Komogortsev
#cs.HC
The recent success of deep learning (DL) has enabled the generation of high-quality synthetic data, advancing the development of data-driven biometric applications. Among various biometric modalities, eye movement sequences have emerged as a promising behavioral biometric. However, gaze data also raises privacy concerns because it may encode individuals' internal states, such as fatigue, emotional load, and stress. Ideally, synthetic gaze data should preserve the signal quality of real recordings, including identity features, while removing or attenuating privacy-sensitive, state-related attributes to reduce risks of personal state exposure. Many recent DL-based generative models focus on replicating real gaze trajectories but do not explicitly evaluate whether generated signals retain subjective-state information. In this work, we examine a recent diffusion-based gaze synthesis approach by analyzing the correlations between synthetic gaze features and subjective reports, including fatigue and other self-reported states. Our results show that these correlations are weaker and less stable in synthetic gaze than in real gaze, suggesting the attenuation of state-related signatures under the evaluated protocol. At the same time, synthetic gaze preserves essential signal characteristics similar to real data, supporting its potential use in privacy-aware gaze-based applications.