Experts vs. novices

Abstract

We present in this paper a novel study aiming at identifying the differences in visual search patterns between physicians of diverse levels of expertise during the screening of colonoscopy videos. Physicians were clustered into two groups -experts and novices-according to the number of procedures performed, and fixations were captured by an eye-tracker device during the task of polyp search in different video sequences. These fixations were integrated into heat maps, one for each cluster. The obtained maps were validated over a ground truth consisting of a mask of the polyp, and the comparison between experts and novices was performed by using metrics such as reaction time, dwelling time and energy concentration ratio. Experimental results show a statistically significant difference between experts and novices, and the obtained maps show to be a useful tool for the characterisation of the behaviour of each group.

Statistical modeling of dynamic eye-tracking experiments: Relative importance of visual stimulus elements for gaze behavior in the multi-group case

“…There are different approaches for comparing gaze behavior in dynamic scenes. Besides using metrics such as reaction time, dwelling time in AoIs and energy concentration ratios (Bernal et al, 2014;Fontana et al, 2017), some approaches take into account scan patterns. These approaches are based on evaluating similarity with sequence alignment scores followed by testing for statistical differences (Feusner & Lukoff, 2008) or providing a similarity score for two scanpaths based on their morphology and, optionally, duration in an AoI (Frame, Warren, & Maresca 2018).…”

“…Exploring gaze behavior is a popular research method in many domains, since it can tell us how we are filtering information and how we might differ in our perception. Examples of between-group comparisons include differences in gaze behavior of experts and laymen (Bernal et al, 2014;Giovinco et al, 2014;Harezlak, Kasprowski, & Kasprowska, 2018), differences between elderly and younger people (Fontana et al, 2017) or differences in visual exploration due to native language (Stutterheim, Andermann, Carroll, Flecken, & Mertins, 2012). Besides comparisons of natural groups, differences in gaze behavior are studied subject to different experimental conditions like manual driving and highly automated driving (Navarro, Mara Stadler mara.stadler@helmholtz-muenchen.de Extended author information available on the last page of the article.…”