Eye-Tracking in Media Research

A fixation is a brief period (often 200–300 ms) during which the eye is relatively still and visual information is taken in; fixations are where processing happens. A saccade is the rapid ballistic movement between fixations, during which vision is largely suppressed so little new information is acquired. Eye-tracking analysis classifies the raw gaze stream into these events, because counting and timing fixations on areas of interest is what reveals attention allocation.

Not necessarily. Fixation on an element indicates overt attention was directed there, which is usually a prerequisite for processing, but it does not guarantee comprehension, encoding, or persuasion — people can look without absorbing, or absorb peripherally without fixating. This is why eye-tracking is most powerful when combined with downstream measures like recall, recognition, or attitude change, which test whether attended content was actually processed.

They should be defined a priori, based on the research question and stimulus design, before examining the gaze data. Drawing or adjusting AOIs after seeing where people happened to look lets the data shape the hypotheses and inflates false-positive findings. Preregistering AOIs and metrics, as in any confirmatory study, keeps the analysis honest; exploratory AOI analysis is legitimate but should be labeled as such.