a technique of seeking to control certain emotional states, such as anxiety or depression, by training oneself, with the aid of electronic devices, to modify autonomic body functions, such as blood pressure or heartbeat
See biofeedback in American Heritage Dictionary 4
noun
The technique of using monitoring devices to furnish information regarding an autonomic bodily function, such as heart rate or blood pressure, in an attempt to gain some voluntary control over that function. It may be used clinically to treat certain conditions, such as hypertension and migraine headache.