Abstract
Previous research (Andersen & Kim, 2001) has shown that a linear trajectory collision event (i.e., a collision between a moving object and an observer) is specified by objects that expand and maintain a constant bearing (the object location remains constant in the visual field). In the present study, we examined the optical information for detecting a collision event when the trajectory was of constant curvature. Under these conditions, a collision event is specified by expansion of an object and a constant rate-of-bearing change. Three experiments were conducted in which trajectory curvature and display duration were varied while time to contact, speed, and initial image position of the collision objects were maintained. The results indicated that collision detection performance decreased with an increase in trajectory curvature and decreased with a decrease in display duration, especially for highly curved trajectories. In Experiment 3, we found that the presentation of a constant rate-of-bearing change in noncollision stimuli resulted in an increase in the false alarm rate. These results demonstrate that observers can detect collision events on curved trajectories and that observers utilize bearing change information.
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This research was supported by NIH Grants AG13419 and EY18334.
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Ni, R., Andersen, G.J. Detection of collision events on curved trajectories: Optical information from invariant rate-of-bearing change. Perception & Psychophysics 70, 1314–1324 (2008). https://doi.org/10.3758/PP/70.7.1314
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DOI: https://doi.org/10.3758/PP/70.7.1314