Figure 2
From: Contribution of the slow motion mechanism to global motion revealed by an MAE technique
Adaptation stimuli in Experiment 1. The arrows showed the motion directions of the 0.53 cpd grating and the components of 2.13 cpd drifted in opposite directions or vise versa. (A) Expansion/Contraction Condition: four identical compound motion Gabor patches drifted away from the center (thus creating an expansion, as shown by the arrows) or toward the center (thus creating a contraction motion). (B) Rotation Condition: four compound motion Gabor patches with different drifting directions in a circular arrangement when a global rotational motion (counter-clockwise as shown by the arrow) was perceived. (C) Shear Condition: The top and bottom Gabor patch pair moved in opposite directions to the left and right Gabor patch pair. (D) Distortion Condition: The two vertical Gabor patches move toward the center while the two horizontal Gabor patches move away from the center. (E) Uniform Motion Condition: all four Gabor patches move in the same direction. (F) Random Motion Condition: the four Gabor patches drift in no systematically defined directions except that one patch moved horizontally so that the MAE direction was either left or right. The other three moved in directions randomly selected from angles between 30 and 330 degrees with a separation of 30 degrees from trial to trial. We regenerate the stimulus in the cases that the arrangement resembled any of the other types of arrangement. (G) Single element condition: A single Gabor patch was presented at the right of the fixation and it moved horizontally.
