Stability of Intra-Session ECG Biometric Features

Determine whether intra-session ECG biometric results fully reflect stable biometric properties or instead partly capture session-specific effects such as electrode placement, posture, or psychophysiological state.

Background

Many ECG biometric studies evaluate training and testing within the same recording period and report excellent performance. Such protocols may conflate subject-specific cardiac traits with factors specific to the recording session, including electrode placement, posture, and psychophysiological state.

The unresolved issue is whether high intra-session performance demonstrates a stable cardiac biometric signature or reflects acquisition-related and contextual features that may not persist across sessions. The paper addresses related cross-session robustness through its evaluation protocol, but does not definitively resolve this general interpretive question.

References

This raises the question of whether intra-session results fully reflect stable biometric properties or instead partly capture session-specific effects .

— Learning Cardiac Features: ECG Biometrics Across Time and~Exercise  (2609.21962 - Thiebaud et al., 18 Sep 2026) in Section 2, subsection “Methodological Limitations,” subsubsection “Cross- vs. Intra-session”