How can FaceScan capture a Users stress level?
Heart rate variability (HRV) is an indicator of the underlying activity of the autonomic nervous system, specifically, the balance between the sympathetic and parasympathetic nervous systems. HRV has been a reliable indicator to measure stress. Existing methods for assessing HRV are ECG or PPG. Using TOI, our technology can measure HRV non-invasively and in a contactless way.
The FaceScan technology begins by taking continuous heart rate measurements of a large sample using traditional, contact-based methods (e.g. EKG). It then uses this data to generate models of stress to derive a ground truth and then compares it with TOI signal results.
These values are then converted into a stress index with 5 levels, where 1 is the lowest and 4.9 is the highest. The difference between each level represents one standard deviation.
Further information regarding our research publication on stress capturing, will be provided following the joint execution of an NDA.