Schematic representation of the sequence of experimental events.

<p>The onset of the stimulus could be triggered by pressing the space key. After displaying a fixation stimulus for 1000 ms, one digit was randomly presented in one of 20 positions (as represented by the figure with dots) within five degrees of eccentricity (i.e., 1°, 3°, 6°, 9°, and 11°) for 100 ms. The participants then answered questions about stimulus detection and identification. Note that the lines, dots, and degree numbers in the second panel of this figure were not present in the actual test stimuli.