biofeedback
noun
bio·feed·back
ˌbi-(ˌ)ō-ˈfēd-ˌbak
: the technique of making unconscious or involuntary bodily processes (such as heartbeats or brain waves) perceptible to the senses (as by the use of an oscilloscope) in order to manipulate them by conscious mental control
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Merriam-Webster unabridged
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