FIGURE 3.

Experimental procedure. A 30 s long-baseline recording was followed by a 0.5 s long fixation point shown in the center of the computer screen. After turning off the fixation point, subjects saw a randomly chosen jigsaw puzzle piece, followed by 0.75 s long white noise masking image. Subsequently, the puzzle template was shown on the screen for 3 s during which the subjects had to give a “Yes” (“Matched”) or “No” (“Unmatched”) answer. Another 0.75 s long white noise masking image was followed by an inter-stimulus interval randomly chosen from the range of 9–12 s.