Which equation correctly represents sensitivity in EEG recordings?

The equation that correctly represents sensitivity in EEG recordings is defined as the ratio of voltage to pen deflection. Sensitivity refers to how responsive the EEG system is to electrical potentials. A higher sensitivity means that even small changes in voltage will result in a noticeable deflection of the pen on the recording medium.

Specifically, the formula for sensitivity can be expressed as:

Sensitivity = Voltage / Pen Deflection

This means that if we increase the voltage (the electrical signal detected by the electrodes), the pen will deflect more on the recording, allowing for greater detection of subtle changes in neural activity. The concept behind this is crucial in EEG, as it helps technicians and clinicians accurately interpret brain activity by ensuring that the recorded signals are appropriately scaled for analysis.

The other options reflect incorrect relationships and would not yield the correct understanding or calculation of sensitivity in EEG recordings. For example, if sensitivity is represented as pen deflection over voltage or any variation that misrepresents the inherent relationship, it would lead to confusion in interpreting the data effectively.