The Need for Real-Time Metrics and Related Research Protocols

the field toward real-time use of gaze as active or passive modality. When active, gaze can imbue interaction within the user’s egocentric peripersonal space, e.g., for selection. When passive, gaze serves as context for other interaction modalities, e.g., as cues. In both cases, system response needs to be immediate, i.e., real-time. In such scenarios, the system needs information not only from traditional gaze-related metrics such as “what is being fixated” but also from real-time dynamics of gaze just after the given fixation. Although recent advances in real-time metrics have appeared, thus far they have only been evaluated on data that was previously captured, i.e., re-streamed. What are needed are protocols designed to evaluate real-time metrics to validate their efficacy. In this position paper, we review two real-time metrics and suggest potential for future directions of their evaluation.