Fig. 9.

Gaze direction in azimuth and elevation components (in Fick coordinates, see Haslwanter (1995)) with respect to the center of the scene camera of the Tobii Pro Glasses 2 (see https://www.tobiipro.com/product-listing/tobii-pro-glasses-2-sdk/). The left panels depict azimuth and elevation for the left eye. Right panels depict azimuth and elevation for the right eye. Top panels represent the 2D-histogram of gaze directions during fixations, where brighter colors indicate a higher frequency of occurrence. Bottom panels depict the same histograms, but depicted as a 3D view. All fixations from all participants were pooled for this figure. Per-participant analyses of gaze direction yield the same pattern; only the maximum of the histogram is shifted slightly per participant