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2D motion aliasing yielding 3D ambiguity. A study with variants of a necker cube

Tested the effect of rotation speed on the rate and temporal distribution of perceptual reversals (PRs) and offered a theoretical interpretation. The alternation rate of 2 3D interpretations is constant with the rotation speed up to some critical value (around 25 turns/min for a cube whose sides subtend 2.5 deg) and increases monotonically thereafter. It is proposed that the additional PRs seen at high rotation speeds are due to the increased frequency of the crossovers of the cube's edges. These crossovers yield 2D motion "aliasing" and "veridical" motion components. The motion aliasing hypothesis was tested and supported in a series of experiments showing that, for rotation speeds higher than 25 turns/min the PR rate increases with the crossover frequency at a constant speed, with linear speed at a constant crossover frequency and with the similarity of the crossing bars in terms of their orientation, polarity and spatial overlap. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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