Biofeedback is a method for teaching people how to control various physiological functions in their own bodies. The individual wears various physiological sensors that pick up electrical signals generated by various parts of the body or other kinds of body activity that can be assessed by other kinds of sensors—for example, stretch sensors to assess breathing, pressure sensors to assess tightness of sphincters, or thermal sensors to assess temperature in various parts of the body. The measures are usually shown on a computer screen, although sometimes the physiological information is conveyed through auditory or simple visual stimuli (light bars, etc.), without the use of a computer.

Although some measurement technologies are highly complicated and require considerable training to perform, some are quite simple. For example, ...

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