The recording of eye movements is based on which electrical potential difference?

The correct choice focuses on the electrical potential difference between the cornea and the retina, which is essential for the accurate recording of eye movements, particularly in the context of an electrooculogram (EOG). This potential difference arises because the cornea is positively charged compared to the retina, creating an electrical field that can be measured as the eyes move.

When the eyes shift, the change in the potential difference can be detected, allowing for the tracking of eye movements. This method is widely employed in sleep studies and other medical assessments where monitoring eye behavior is crucial. The other options do not reflect the underlying physiological basis for eye movement detection as effectively, making this the most relevant choice.