Perceptual span in Mongolian text reading

In this study, an eye-tracking experiment was conducted to investigate the perceptual span during traditional Mongolian reading, a script uniquely written vertically. We adopted a gaze-contingent moving-window paradigm to measure the size of the perceptual span when reading traditional Mongolian sentences. The results showed that the perceptual span was asymmetric downward, extending one syllable above the fixation and three syllables below the fixation. These findings are important for understanding how reading direction affects the underlying cognitive mechanisms during reading and will help to understand the universal mechanisms of reading.