Using the protocol described by Pandey et al.,70,71 each participant was presented with 4 types of visual stimuli consisting of white isosceles triangles pointing in the up, down, right, or left direction. The stimuli were presented for 100 ms at the center of a computer screen (17 inches diagonally, 75-Hz refresh rate, 1,024 × 768 resolution) against a dark background that subtended a visual angle of approximately 1°. In the practice session, participants were instructed to press a key whenever a white triangle pointed up or down (go stimulus) and refrain from pressing the key whenever the triangle pointed toward the right or left (no-go stimulus). A dollar sign ($) appeared on the screen for 200 ms at 1,200 ms after stimulus onset when participants responded correctly, whereas a cross sign (X) appeared on the screen for 200 ms at 1,200 ms after stimulus onset when participants responded incorrectly. Participants were instructed that speed and accuracy were equally important for making a correct response. In the next, experimental, phase, EEG was recorded. Participants were informed that each correct response would
