Visible Persistence Is Reduced by Fixed-Trajectory Motion but Not Random Motion

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Conducted 4 experiments with 2 experienced observers (including the author) to examine whether there is a motion-specific influence on visible persistence. Specifically, points moving in constant directions, or fixed trajectories, show less persistence than points moving with the same spatial and temporal displacements but taking random walks, randomly changing direction each frame. Ss estimated the number of points present in the display for these 2 types of motion conditions. Under conditions chosen to produce good apparent motion, the apparent number of points for the fixed-trajectory condition was significantly lower than the apparent number in the random-walk condition. Thus, the enhanced suppression of persistence observed for a target moving in a consistent direction depends on the activation of a directionally tuned motion mechanism extended over space and time.



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