Dissociation of discrimination thresholds for time to contact and for rate of angular expansion

  title={Dissociation of discrimination thresholds for time to contact and for rate of angular expansion},
  author={David M. Regan and Stanley J. Hamstra},
  journal={Vision Research},
Nonlinearities in the visual processing of motion and form
Hoyle (1957) showed that, for a rigid sphere moving along the line of sight at constant speed, time to collision is approximately equal to the ratio /spl theta//spl theta/, where /spl theta/ is the
Visual processing of looming and time to contact throughout the visual field
Time-To-Contact Estimates for Observer versus Target Motion
The ratio (τ) of a moving target's angular size to the rate of change in its angular size can be used by observers to judge the time remaining before they will collide with the target. We consider
Do Monocular Time-to-Collision Estimates Necessarily Involve Perceived Distance?
It is concluded that time-to-collision research should move away from the either/or analysis of different information sources that has dominated previous studies towards investigations of how different information Sources are integrated, and that perceived distance should be ignored when estimating time to collision.
Direct perception of time-to-contact : temporal and visuo-spatial constraints
Experimental results were taken as strong evidence supporting claims of a mechanism which directly extracts TTC from the optic flow pattern, and as supporting the conclusion that TTC estimation in the PM procedure was based on the stimulus information at, or immediately preceding the moment of occlusion.
Visual Processing of the Motion of an Object in Three Dimensions for a Stationary or a Moving Observer
Subjects are able monocularly to discriminate the direction of motion in depth with high acuity in the vertical, horizontal, or oblique meridians, even when the direction and the speed of translational motion are removed as cues.
Visual discrimination thresholds for time to arrival
A complete replication of Todd’s experiment was done, and his stimuli and experimental regime were modified, which it is hypothesized may have been responsible for some of the discrepancies reported in the literature.


Device for measuring the precision of eye-hand coordination while tracking changing size.
This work describes a procedure for quantifying a subject's ability to track changing size, and illustrates the procedure with preliminary experimental data, and measures the perturbing effect of sideways motion upon the subject'sAbility to Track changing size.
Visual responses to changing size and to sideways motion for different directions of motion in depth: linearization of visual responses.
This psychophysical study explored one possible basis for visually judging the direction of motion in depth. We propose that the changing-size channels precisely compute the algebraic difference
Visual Sensitivity to the Shape and Size of a Moving Object: Implications for Models of Object Perception
It is proposed that the human visual system acts as though it contains detectors sensitive to the size and shape of an object and that these detectors enhance this sensitivity to shape and size by comparing the velocities of the horizontal and vertical edges.
Visual Timing in Hitting An Accelerating Ball
To investigate the timing of actions relative to events in the environment, subjects leapt to punch a falling ball and analysed their knee and elbow angles as functions of time for three ball-drop heights, finding that the differences in the functions could be explained on the basis that the subjects were gearing their actions to a particular optic variable.
Visual Judgements and Misjudgements in Cricket, and the Art of Flight
It is suggested in this paper that batsmen supplement inadequate retinal image information about where the ball will hit the ground with prior knowledge built up over the preceding few deliveries.
Velocity discrimination in central and peripheral visual field.
Results are in agreement with the predictions derived from the response characteristics of velocity-tuned cells and the shift toward higher velocities with increasing eccentricity was much clearer for the lower end of the velocity-discrimination curve than for the upper end.
Visual processing of four kinds of relative motion
Identifying the acceleration of visual targets.
It was shown, through reference to other studies, that it is more difficult to identify gradual change of velocity than to identify instantaneous change or to discriminate between two ongoing motions of different constant velocities.