Figure 3.

Stimuli used in the second experiment. (A) An array of 30 Gabor patches was presented during adaptation. The two adapted locations (circled) contained drift-balanced motion (no net directional motion). The eight Gabors immediately surrounding the adapted locations also contained drifting sine wave contrast modulations in both directions simultaneously, but the contrast of one direction was increased (to 0.79 Michelson contrast), whereas the contrast of the oppositely drifting component was reduced (to 0.37 Michelson contrast). The size of the arrows in the Gabors surrounding the adapted locations therefore indicate an imbalanced motion signal. The Gabors in the two columns closest to the fixation point contained randomized directions on each trial to increase the effectiveness of crowding and to prevent discrimination of global motion direction in the top or bottom halves of the display. (B) The test Gabors were drift-balanced orthogonal versions of the adapted Gabors in Panel A. (C) Perceived misalignment between the test Gabors following motion adaptation in the surrounding region. The circles were not visible in the actual experiment.