We measure brainwaves while you are under stress to determine how well your nervous system is functioning. The different types of brainwaves that we measure are; Beta, Theta, Aplha, SMR. These brainwaves should be used at different times for different reasons. Here is a general description of when these brainwaves should be used. Beta- Processing information, Responding to stress. Theta- Relax and recovery Alpha- Relax and recovery SMR(Sensory Motor Rhythm)- Used for postural muscle control. Increases when relaxed.