Table 2 The basic significance of eye movement indicators

Total fixation duration

It refers to the total amount of fixation time in an area. It can reflect the cognitive difficulty level of the image, and the longer the total fixation time, the higher the attention level of the subject to the area, the greater the difficulty of processing information, and the richer the image information

First fixation duration

The amplitude between eye jumps refers to the average amplitude of eye jumps, and the greater the average amplitude of eye jumps, the lower the interest of Subjects in landscape information between fixation points

Average fixation duration

It refers to the duration of the first gaze at a certain object or area, usually used to indicate the initial attention tendency of the subject towards the image

Fixation count

It refers to the total fixation time divided by the total fixation frequency. The average fixation time is mainly related to the attention, perception, and cognitive processes related to scene analysis and understanding, and can be used to explain the level of understanding of images

Average saccade amplitude

It refers to the total number of fixations, which is an indicator of the degree to which the subject attaches importance to the evaluation area and can also reflect the subject’s level of interest in the image

Saccade counts

It refers to the number of eye searches between fixations, and the higher the number, the richer the landscape features