Perceiving visual expansion without optic flow

@article{Schrater2001PerceivingVE,
  title={Perceiving visual expansion without optic flow},
  author={Paul R. Schrater and David C. Knill and Eero P. Simoncelli},
  journal={Nature},
  year={2001},
  volume={410},
  pages={816-819}
}
When an observer moves forward in the environment, the image on his or her retina expands. The rate of this expansion conveys information about the observer's speed and the time to collision. Psychophysical and physiological studies have provided abundant evidence that these expansionary motions are processed by specialized mechanisms in mammalian visual systems. It is commonly assumed that the rate of expansion is estimated from the divergence of the optic-flow field (the two-dimensional field… Expand

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