Evidence for two speed signals: a coarse local signal for segregation and a precise global signal for discrimination

@article{Bravo1995EvidenceFT,
  title={Evidence for two speed signals: a coarse local signal for segregation and a precise global signal for discrimination},
  author={Mary J. Bravo and Scott N. J. Watamaniuk},
  journal={Vision Research},
  year={1995},
  volume={35},
  pages={1691-1697}
}
In calculating the precise speed of an object, the visual system must integrate motion measurements across time and space while keeping motion measurements from different objects separate. We examined whether an initial coarse estimate of local speed may be used to segregate the motions of different objects prior to a precise calculation of object speed. Our stimuli consisted of 256 dots that moved upward at two speeds. In Expt 1, each dot alternated between the two speeds every 133 msec. When… CONTINUE READING

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