Now we will prepare the areas beside each eye. The areas in question are asymmetrical so it will be important to remember that left and right refer to the participant's left and right.
The electrodes that will be placed here will measure eye movements overnight. This information will be useful for us to distinguish between wake and sleep and to identify REM sleep (i.e. when someone is dreaming)
Start with the right eye. Swab the area 1cm out and 1cm up from the outer canthus (the outer corner of the eye). This area corresponds to the E2 label in the image.
Moving to the left eye, swab the area 1cm out and 1cm down from the left outer canthus (E1 in the image).
Abrade both areas for 30 seconds.