The mid-frequency component of Heart Rate Variability (HRV) is utilized in many studies to measure the level of mental effort in Human-Computer Interaction (HCI). However, the temporal resolution that can be achieved using this method is underestimated. For refining the specification of the exact temporal resolution of this method, we employed a visual search task that required elevated levels of mental effort. Participants had to find one difference between pairs of pictures. Each of the twelve pairs was followed by a congratulation screen causing a short period of relief (5-6 seconds). Using our method based on power spectra analysis and windowing functions, we were able to differentiate between the HPV mid-frequency values of the visual search and the relief periods. These results, along with previous findings, seem to suggest that the temporal resolution of 5-6 seconds can be achieved with our method, widening the range of applications.
CITATION STYLE
Hercegfi, K., & Köles, M. (2019). Temporal resolution capabilities of the mid-frequency heart rate variability-based human-computer interaction evaluation method. Acta Polytechnica Hungarica, 16(6), 95–114. https://doi.org/10.12700/APH.16.6.2019.6.7
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