Table 2.

Eye-tracking measurement indicators and measurement content.

Indicators	Measurement Content
Eye tracking trajectory	Individuals’ gaze positions, gaze durations, and gaze sequences when observing stimulus materials. In eye tracking trajectory graphs, observation time is typically represented by circles of varying diameters. The longer the duration of fixation, the larger the radius of the circle, indicating greater attentional engagement. The sequence of fixations is usually displayed on the circles with numbers, such as 1, 2, 3, indicating the first location observed by the participant, followed by subsequent locations, and so on.
Heatmap of eye movements	The average fixation duration is the mean duration of all fixations within an area of interest. Selecting this metric allows for further analysis of the degree of interest in different decisions among participants with different characteristics.