How will the amplifier display move in response to the difference between the voltages in input 1 and input 2?

The amplifier display's movement in response to the difference between the voltages in input 1 and input 2 is characterized by its ability to reflect positive and negative differences in voltage. When the voltages at the two inputs are equal, the display will remain stable. If input 1 has a higher voltage than input 2, the amplifier output will move in one direction—upward in this case. Conversely, if input 2 has a higher voltage than input 1, the output will move downward.

Thus, the display of the amplifier can move either up or down, depending on which input has the greater voltage. This bidirectional capability is essential for accurately monitoring the differences in electrical activity, particularly in a clinical setting where the response can provide critical information about neural function or dysfunction.

The other options suggest a one-directional response, which does not account for the range of possible voltage differences. Therefore, the comprehensive understanding of the amplifier's response is encapsulated in the acknowledgment that it can move either up or down, reflecting the relationship between the two input voltages.