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Search display. In all four conditions Gabor patches were embedded equally often at 25 possible target locations in the 1/f noise background, indicated by the white circles (they were not shown to the participants). The noise background had a diameter of 17 deg in the photopic high-sf and medium-sf as well as in the scotopic medium-sf condition. A larger diameter of 32 deg was used in the scotopic low-sf condition.
