15:00 - 16:30
Wed—Casino_1.801—Poster3—87
Wed-Poster3
Room:
Room: Casino_1.801
People are sensitive to their uniquely patterned retinal input
Wed—Casino_1.801—Poster3—8704
Presented by: Amit Rawal
Amit Rawal 1, 2*Rosanne L. Rademaker 1
1 Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Frankfurt, Germany, 2 Faculty of Behavioural and Human Movement Sciences, Vrije Universiteit Amsterdam, The Netherlands
Visual exploration through eye movements involves frequent changes to the visual input on our retinae. This visual input is patterned by factors such as where we look, how often we move our eyes, and our behavioural goals. Previous research has shown consistencies in saccade behaviour within individuals over a variety of images and tasks, resulting in uniquely patterned visual input for different people. Are people sensitive to their own pattern of visual input, and can they distinguish it from the input of others? To test this, we recorded subjects’ eye position during free-viewing of natural scene stimuli. From these gaze trajectories, we cropped 7º radius images around individuals’ eye positions, to create a sequence of images for later replay at fixation. Each subject viewed 100 replays created from their own eye data, and 100 from other subjects’ data. Nearly all subjects performed above-chance at choosing whether a replay was theirs or not, with higher confidence on correct than incorrect trials. Subjects responded fastest when reporting a replay was theirs (even when it wasn’t), and were relatively quicker on correct trials. Interestingly, pupil size reflected ground truth, with larger dilations as subjects viewed other subjects’ replays, irrespective of their subsequent choice and its accuracy. Additionally, when a subject mistook another subject’s replay as theirs, the scanpath constituting that replay tended to be more similar to their own scanpath on that image during free-viewing. In summary, we find that people are sensitive to visual inputs patterned by their own unique eye movements.
Keywords: Eye movements, individual differences, meta-cognition, free-viewing