Response to the Critical Note “Correcting Some Misperceptions of Time-To-Collision” by James R Tresilian

In an earlier paper, “Misperception of time-to-collision by drivers in pedestrian accidents”, it was proposed that time-to-collision is derived from the angular speed and angular acceleration of an approaching object, with the use of the algorithm 2θ̇/θ̈, rather than from θ/θ̇. This response to the critical paper by Tresilian is intended to support that conclusion, which was based on four main arguments:

(1)

the focus of expansion could not provide a reliable datum for judging θ;