“…By far the most used metric was simply the location of gaze, where researchers used the x and y positions of fixations or gazepoints, and not any higher order metrics, to trigger adaptations (Bektaş et al, 2015, 2019; Gobel et al, 2018; Ho et al, 2018; Jo et al, 2015; Kim et al, 2020; Kurzhals et al, 2020; Lankes et al, 2019, 2020; Sharma et al, 2016; Tateosian et al, 2017; Vidal et al, 2015). The total dwell time in an AOI has also been used to good extent (Cheng et al, 2018; Kim et al, 2020; Toreini et al, 2022). Other types of metrics have been used more sparingly.…”