Shorter Lines Facilitate Reading in Those Who Struggle
Fixation positions are fit to text displayed on the iPod Touch (left panel). The experiment counts the number of fixations (blue dots), regressions (red), and reading speed. Speed is determined by examining the vertical component of the gaze, plotted as a function of time in the left panel. Data in an interval near the start and end of each page is ignored to avoid boundary effects between pages, and a robust linear fit to this data (green) used to compute an instantaneous measure of reading rate.