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Example of stimuli used in the training. The central Gabor was the target varying in contrast according to a staircase. Flanking Gabors had a fixed contrast of 0.6 Michelson contrast. The target-to-flankers distance was varied across blocks (i.e., 1.5, 3, 4, and 8λ; from left to right). The contrast of the target was increased for demonstrative purposes.
