Is Judging Time-to-Contact Based on ‘Tau’?

An investigation was undertaken into whether judgments of time-to-contact between a laterally moving object and a bar are based on the direct perception of an optical variable (tau), or on the ratio between the perceived distance and perceived velocity of the object. A moving background was used to induce changes in the perceived velocities without changing the optical variables that specify time-to-contact. Background motion induced large systematic errors in the estimated time-to-contact. It is concluded that the judgment of time-to-contact is primarily based on the ratio between the perceived distance and the perceived velocity, and not on tau.

[1]  David N. Lee,et al.  Visual Timing in Hitting An Accelerating Ball , 1983, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[2]  James R. Tresilian,et al.  Approximate information sources and perceptual variables in interceptive timing. , 1994 .

[3]  E. Brenner,et al.  The difference between the perception of absolute and relative motion: a reaction time study , 1994, Vision Research.

[4]  G. J. Savelsbergh,et al.  Grasping tau. , 1991, Journal of experimental psychology. Human perception and performance.

[5]  David N. Lee,et al.  A Theory of Visual Control of Braking Based on Information about Time-to-Collision , 1976, Perception.

[6]  E. Brenner.  Judging object motion during smooth pursuit eye movements: The role of optic flow , 1991, Vision Research.

[7]  E Brenner,et al.  Perception and action are based on the same visual information: distinction between position and velocity. , 1995, Journal of experimental psychology. Human perception and performance.

[8]  J. Tresilian.  Perceptual Information for the Timing of Interceptive Action , 1990, Perception.

[9]  Eli Brenner,et al.  Perceived motion in depth , 1996, Vision Research.

[10]  R J Bootsma,et al.  Visual information about time-to-collision between two objects. , 1993, Journal of experimental psychology. Human perception and performance.

[11]  D. Regan,et al.  Necessary conditions for the perception of motion in depth. , 1986, Investigative ophthalmology & visual science.

[12]  Herbert Heuer.  Apparent Motion in Depth Resulting from Changing Size and Changing Vergence , 1987, Perception.

[13]  J Vautrin,et al.  Fast presynaptic GABAA receptor‐mediated Cl‐ conductance in cultured rat hippocampal neurones. , 1994, The Journal of physiology.

[14]  H. Heuer,et al.  Estimates of Time to Contact Based on Changing Size and Changing Target Vergence , 1993, Perception.

[15]  W. A. van de Grind,et al.  Reaction times to motion onset and motion detection thresholds reflect the properties of bilocal motion detectors , 1989, Vision Research.