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Spatio-temporal vernier acuity

Three experiments assessed the spatio-temporal vernier (STV) acuity and velocity discrimination with 2F stimuli. STV was analyzed from 2 independent perspectives, both of which pose that STV is reducible to a velocity discrimination task. The empirical approach consisted in decomposing the task into a sequence of 3 velocity judgments, the 3rd of which (STV) is derived from the preceding two. Given their variability, this model provided reasonable fits to the STV data. The theoretical approach used the notion that STV performances reflect the velocity discrimination capacities of the visual system. Accordingly, it predicted that STV performances as a function of Delta T should lie on a straight line in space-time (i.e., a constant velocity [V]) with a non-zero intercept at the origin of space time and that the slope of this line should coincide with the minimum discriminable V in a standard experiment. The measured STV functions are consistent with both these predictions, strongly suggesting that the STV task is indeed equivalent to a V-discrimination task. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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