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Bistable visual stimuli used in this experiment. a Necker Cube (NC): front surface flips with time; b structure-from-motion (SFM): sphere made of dots seems to move in anticlockwise or clockwise direction; c stroboscopic alternative motion (SAM): frame1 and frame2 are presented in such a manner that there lies an ambiguity in the direction in which dots move—horizontally or vertically
