Citation

Regan D. Vision Res. 2002; 42(22): 2479-2484.

Affiliation

Department of Psychology BSB, Center for Vision Research, York University, 4700 Keele Street, Ont., M3J 1P3, North York, Canada. dregan@yorku.ca

Copyright

(Copyright © 2002, Elsevier Publishing)

DOI

unavailable

PMID

12445841

Abstract

It is well known that, when an object's horizontal relative disparity is changing appropriately, most observers report a compelling impression that the object is approaching and will collide with the observers at some future instant. Here I derive a new equation, namely TTC approximates (ddelta/dt)/(d(2)delta/dt(2)). This equation relates TTC to retinal image variables without involving a knowledge of the approaching object's distance or speed. In this respect the new equation is the binocular equivalent of the well-known equation for tau.

Language: en