Comparison with the gold standard
SPECTRAL COMPARISON OF EEG DATA
As can be seen from the spectrograms, the Hypnodyne ZMax EEG signal is virtually indistinguishable from EEG signal acquired with gold standard PSG equipment. ZMax is able to acquire such a high fidelity signal even without skin preparation or gels.
HEART RATE COMPARISON
The heart rate plot obtained by photoplethysmography (PPG) closely matches the Vitaport heart rate obtained by EKG. Currently the algorithm prioritizes accuracy over resolution but the raw PPG data is available if you wish to process the signal by yourself in MATLAB and easily get more resolution.
Download the data files