At a sensitivity of 3µV/mm, what voltage is represented by a 7mm deflection?

To determine the voltage represented by a 7 mm deflection at a sensitivity of 3 µV/mm, you simply multiply the deflection by the sensitivity value.

In this case, the calculation involves the following steps:

1. Begin with the deflection measurement: 7 mm.

2. Multiply the deflection by the sensitivity level: 7 mm × 3 µV/mm.

Performing the multiplication gives:

7 mm × 3 µV/mm = 21 µV.

Thus, a deflection of 7 mm at a sensitivity of 3 µV/mm corresponds to a voltage of 21 µV. This makes the correct choice the one that accurately reflects this calculated voltage, which is 21 µV. Understanding how sensitivity relates to deflection in an EEG context is crucial, as it directly influences the interpretation of the recorded brainwave activity.