The below demonstration suggested that the factor of eccentricity was a critical necessity for the occurance of the new type of perceived spatial displacement. When the fixation point was aligned with both motion defined edges of the expanding and contraction patterns, i.e. a ‘zero eccentricity’ condition, no perceived edge displacement was observed. However, when the eccentricity increased, the observers can perceive a vivid edge displacement even when the edges between the expanding and contracting translations were physically aligned. Also, the magnitude of the edge displacement seemed to increase with the eccentricity of the fixation. These observations are consistent with the results of previous study (Raymond, 1994) that a ‘centripetal bias’ was absent in central fovea but present in peripheral viewing and increased with the eccentricity.