HeartMath is not at all the only company doing biofeedback, although the emWave PSR, at $200, is more affordable than most other devices. For the better part of a decade, other companies have used ...

Stress can cause frustration, anxiety, poor performance, anger, worry, depression, and fatigue. The emWave Mac Stress Relief System, developed by the Institute of HeartMath, is a real-time biofeedback ...