Fig 1.
Schematic representation of the experimental task.
(A) An example of the screen without the random signal (i.e., red dot). (B) An example of the screen with the random signal (i.e., red dot).
Fig 2.
Measures of behavioral performance.
(A) The mean distance between the tracking circle and the target ball. (B) The reaction time to the random red dot. (C) The signal detection accuracy rate to the random red dot. *p < 0.05, **p < 0.01.
Fig 3.
Event-related potentials elicited by the random signals (red dots) in the first and second intervals.
Fig 4.
Mean event-related potential amplitudes and p-values.
Fig 5.
Relationship between the difference value of the subjective sleepiness scores and the P3 amplitude difference value.