Why do many scientists measure eye movement as a way of understanding cognition?

Question

Quizplus · Accepted Answer

Eye movement can indicate where a person is directing their attention, and it is often assumed that if someone is looking at something for a prolonged period of time, it is because they are processing information about it. This is why eye movement is often used as a way of understanding cognitive processes such as visual attention and memory. While eye movement does not directly correlate with olfactory or auditory systems, it can still provide valuable information about how the brain processes sensory information.

Why Do Many Scientists Measure Eye Movement as a Way