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(a–d) examples of the experimental stimuli. (a) Target patches have an orientation s.d. of 1° and a mean orientation of −4° (counter-clockwise from vertical). (b) As (a) with an orientation s.d. of 16° and a mean tilt +20°. (c, d) Similar to (a) and (b) respectively, but with the addition of randomly oriented distractor elements.
