What is the resulting output when two inputs of opposite polarity are subtracted in the differential amplification process?

In the context of differential amplification, when two inputs of opposite polarity are subtracted, the resulting output is primarily characterized as cancellation. Differential amplifiers are designed to amplify the difference between two input signals while rejecting any signals that are common to both inputs. When one input has a positive voltage while the other has an equal negative voltage, their subtraction will effectively nullify the output, leading to a cancellation of those input signals.

The key aspect of differential amplification is its ability to enhance signal integrity by eliminating noise and interference that may be present equally on both inputs, and this is where the concept of cancellation truly comes into play. Each input's positive and negative contributions can lead to zero output if they are of equal magnitude but opposite in polarity, demonstrating the function of the differential amplifier effectively.

The correct choice emphasizes this primary function of the differential amplifier, aligning with the principles of how such systems are utilized in EEG and other electrodiagnostic measurements to ensure that only the intended signals are processed.