What is the function of a sensory prosthesis?

• A. It replaces sensory input that would normally come from a biological source, such as vision, hearing, or touch.
• B. It provides power to actuators.
• C. It records brain signals for data analysis.
• D. It enhances motor function.

Answer: (A)

The defining function of a sensory prosthesis is to substitute missing sensory input by delivering stimuli to the nervous system so the user can perceive something like vision, hearing, or touch. For example, a cochlear implant takes sound and converts it into electrical signals that stimulate the auditory nerve, while retinal or visual prostheses translate light into neural stimulation to convey visual information, and tactile or haptic devices transmit touch information to nerves or skin receptors. It isn’t primarily about powering actuators, recording brain signals, or boosting motor function—that work falls to other types of devices. The goal here is to restore or substitute sensory information to support perception.