Rotation and radical motion thresholds support a two-stage model of differential-motion analysis.

@article{Gurney1996RotationAR,
  title={Rotation and radical motion thresholds support a two-stage model of differential-motion analysis.},
  author={Kevin N. Gurney and M. Lattimer Wright},
  journal={Perception},
  year={1996},
  volume={25 1},
  pages={5-26}
}
Lower motion thresholds for rotational and radial flow have been measured for stimuli consisting of four closely packed circular apertures, each containing patches of drifting grating or plaid. Detection and direction thresholds were measured for gratings and plaids as a function of the relative orientation of the pattern components. There was a similarity between both types of threshold, supporting the existence of specialised rotation and radial-flow detectors. Further, thresholds increased… CONTINUE READING

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