A Dell laptop with a 15 inch screen was used to run the program. The resolution was 1280 × 1080 pixels, and the refresh frequency was 50 Hz. The distance between the screen and the eyes of the participants was 450 mm. The eye movement of the participants was recorded using an SMI iView XTM RED eye tracking system (SensoMotoric Instruments, Teltow, Germany). The sampling rate was 120 Hz, and the spatial resolution was 0.03°. Eye movement **data** were processed using the SMI BeGazeTM software (SensoMotoric Instruments, Teltow, Germany). Experiments 2A and 2B followed the general procedure of Experiment 1A, except that the 40 experimental trials of each condition were divided into four blocks. Each block started with a five-point calibration to ensure an error of less than 0.5° of visual angle 4 . Experiment 3. The task in Experiment 3A was to find the "O" among "X"s under clear and blurred conditions (for example of stimulus refer to supplemental material). The stimuli under both conditions were static. The stimuli of clear conditions were the same as those in the static conditions of Experiment 1A. Under blurred conditions, the same stimuli as clear conditions were processed using Photoshop to simulate the "blurring" effects of moving objects. The blurred stimuli were generated from the original stimuli using the motion blur filter of Adobe Photoshop CC 74 . The task in Experiment 3B was to find the Landolt ring among "O"s under clear and blurred conditions. The other experimental settings of Experiment 3 were consistent with those of Experiment 1.