What is myoelectric control in prosthetics?

• A. A control method that uses surface EMG signals from muscles to operate an externally powered prosthetic arm
• B. A control method that uses implanted neural signals to operate a prosthetic
• C. A control method that uses a cable system from the opposite shoulder
• D. A control method that uses only inertial sensor data to actuate the limb

Answer: (C)

Myoelectric control centers on converting electrical activity from the user’s residual muscles into commands for an externally powered prosthetic. Surface EMG electrodes placed on the skin detect the muscle’s electrical signals when it contracts, and those signals are processed to drive the prosthetic’s motors, enabling movement that can be proportional to the muscle effort or use pattern-recognition to distinguish between intended grips or actions. This approach relies on electrical signals from muscles rather than mechanical or inertial inputs, which is why it’s described as controlling an externally powered prosthesis.

Why the other ideas don’t fit: implanted neural signals would involve invasive interfaces into nerves or the brain, not surface muscle signals; a cable system from the opposite shoulder uses a body-powered mechanism driven by harness tension rather than electrical muscle signals; using inertial sensors alone would base control on motion data, not on muscle activation. The defining feature of myoelectric control is using surface EMG from muscles to operate a powered limb.