For example, the stimulatory or relaxing effect of different colours can be assessed, as well as the effects of various patterns and images. A reference electrode is placed on the forehead, electrodes are placed on the right and left temples for lateral eye movement detection, and above and below an eye for vertical eye movement detection. Lateral movement and vertical movement are plotted on different channels as voltages, or the EOG can be calibrated for each subject to provide angles of eye movement in both the horizontal and vertical plane. A convenient re-set button allows the instrument to be zeroed when the subject is looking straight ahead. Students are fascinated by the electrophysiology of muscles that control eye movement, and more so by the way in which our eyes track and scan objects.
Numerous experiments are possible to determine how different subjects respond to different images.
Show the subject an advertising poster and determine how the subject's eyes move to the most important features of the image. Advertisers use EOG devises in poster design. Like the GSR sensor, the EOG sensor has applications in both physiology and psychophysiology laboratories, and is always extremely popular with students who wish to investigate how mind and muscle interact.