Do monocular time-to-collision estimates necessarily involve perceived distance?

@article{Gray1999DoMT,
  title={Do monocular time-to-collision estimates necessarily involve perceived distance?},
  author={Rob Gray and David Regan},
  journal={Perception},
  year={1999},
  volume={28 10},
  pages={1257-64}
}
Motivated by the debate between indirect and direct theories of perception, a large number of researchers have attempted to determine whether judgments of time to collision are based on the ratio of perceived distance to perceived speed or on the ratio theta/(d theta/dt), i.e. tau. Despite the considerable research effort devoted to this question there seems to be no clear resolution. We used a staircase tracking procedure to estimate errors in estimating time to collision for a simulated… CONTINUE READING

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