Fig 3. The presentation format of each trial in the test of magnocellular-dorsal function.

In each trial, a fixation point was firstly displayed in the center of the screen for 1500 ms, and then a target grating appeared for 500 ms. The participants were required to press different keys to judge the orientation of the target grating, with “z” for vertical and “n” for horizontal gratings, and the response window lasted for 3000 ms. After that, a fixation point was presented in the screen center in a random interval (from 1000 ms to 1500 ms) between successive trials.