Which of the following factors does NOT favor cancellation of signals in the two inputs of an amplifier?

The focus of this question is on identifying which factor does not contribute to the cancellation of signals in the inputs of an amplifier. Cancellation of signals typically occurs when the unwanted noise or interference affects both inputs equally, allowing the amplifier to filter out these common signals while amplifying the differential signal.

When considering unequal impedances in the inputs, it can actually lead to imbalances in the way signals are processed, potentially allowing certain signals to be amplified differently or even distinctly rather than canceling out. Therefore, unequal impedances make it hard to achieve effective cancellation.

In contrast, shorter interelectrode distances can favor cancellation because they help minimize the effects of crosstalk and interference between inputs. Having equal impedances is also beneficial for cancellation since it ensures that both paths in the amplifier are treated similarly, maximizing rejection of common-mode signals. Cerebral potentials can operate in common mode and are also effectively cancelled in a well-designed differential amplifier.

Thus, the aspect of unequal impedances is the factor that does not favor cancellation, as it disrupts the balance necessary for effective differential amplification and common-mode rejection.