Very few studies have shown biofeedback to be superior to other relaxation techniques for reducing anxiety. Most studies find biofeedback, such as EMG, GSR, and thermal feedback, to be roughly equivalent to progressive relaxation or meditation for anxiety reduction. This may be because anxiety is more related to attention and cognition than physiology. Several studies directly compared biofeedback to other relaxation techniques and found them to have comparable effects on reducing anxiety. Biofeedback is an effective treatment for anxiety, though it shares mechanisms with other relaxation methods rather than being a unique physiological intervention.