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What is employed to measure the variable that is to be controlled by the feedback process?

What is employed to measure the variable that is to be controlled by the feedback process? Correct Answer Transducers

Biofeedback instrumentation for the measurement of EMG, temperature and pulse/heart rate is not different from other instruments used for the measurement of physiological variables. Transducers and amplifiers are employed to measure the variable that is to be controlled by the feedback process.

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