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4L-CARE
Later-Life Language Learning: Considerations for Education and Research
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!! What is eye-tracking? An eye-tracker makes it possible to track gaze-position (i.e., where someone is looking) or someone's pupil size (also called pupillometry). There are several types of eye-tracking systems. The eye-tracker does this by shining (near) infrared light onto the participant's face. This light is not visible to the participant, but it can be picked up by the eye-tracker's camera. The light bounces off the cornea, which the eye-tracking software then uses to determine gaze-position. Tracking someone's gaze-position can for example be used in reading research (e.g., to see how quickly someone reads low-frequency words). Pupillometry is often used in experiments with a cognitive focus, and it is often taken to be an index of mental effort.
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