The points indicate the mean distance of fixations to the image centroid (in pixels). In total, 6,720 participants were included in the analysis; for a more detailed distribution of participants across age groups, please refer to Fig. 2. Please note that each age bin spans two years. Due to space constraints, only every second tick mark is labelled. The error bars indicate ±1 s.e.m. The black lines show the best-fitting polynomials. The horizontal lines above each plot indicate the level of evidence for a given bin to be part of a broad linear change via shades of grey, as shown in the key (sliding window analysis; see main text and Methods). The red shading marks age bins with lower sensitivity to developmental changes, which were disregarded for curve fitting (n < 90 per bin).
