A question we often hear from new users is ‘What do all those colors on the graph mean?
Occasionally you may see that the black line on the graph suddenly becomes red or blue as it moves across the screen. The black line shows the pattern of the Heart Rate Variability (HRV) that the emWave sensor measures.
HRV is the time interval between the heartbeats. Every little moment between each beat is different from the next and is constantly speeding up and slowing down. However, when we are stressed, this speeding up and slowing down is not happening in a consistent manner. If you see this pattern being created on the screen, it will look very jagged and irregular.