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Judgments of relative time-to-contact of more than two approaching objects: Toward a method

Judgments of relative time-to-contact of more than two approaching objects: Toward a method Observers reported which of as many as eight computer-generated approaching objects would “hit” them first. Accuracy was above chance probability except when two-object displays contained pictorial relative size information that contradicted relative time-to-contact (TTC) information. Mean d’ and response time was greater, but mean efficiency (Barlow, 1978) was smaller with eight objects than with two. Performance was less effective when global expansion contradicted TTC information than when local expansion contradicted TTC. Results suggest that observers can judge relative TTC with as many as eight objects when certain sources of information are consistent with TTC and that observers rely on information other than, or in conjunction with, optical TTC. Also, the sources of visual information that affect performance may vary with set size, and identification (but not detection) judgments may be constrained by limited-capacity processing. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Attention, Perception, & Psychophysics Springer Journals

Judgments of relative time-to-contact of more than two approaching objects: Toward a method

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References (73)

Publisher
Springer Journals
Copyright
Copyright © 1997 by Psychonomic Society, Inc.
Subject
Psychology; Cognitive Psychology
ISSN
1943-3921
eISSN
1532-5962
DOI
10.3758/BF03205508
Publisher site
See Article on Publisher Site

Abstract

Observers reported which of as many as eight computer-generated approaching objects would “hit” them first. Accuracy was above chance probability except when two-object displays contained pictorial relative size information that contradicted relative time-to-contact (TTC) information. Mean d’ and response time was greater, but mean efficiency (Barlow, 1978) was smaller with eight objects than with two. Performance was less effective when global expansion contradicted TTC information than when local expansion contradicted TTC. Results suggest that observers can judge relative TTC with as many as eight objects when certain sources of information are consistent with TTC and that observers rely on information other than, or in conjunction with, optical TTC. Also, the sources of visual information that affect performance may vary with set size, and identification (but not detection) judgments may be constrained by limited-capacity processing.

Journal

Attention, Perception, & Psychophysics – Springer Journals

Published: Jan 5, 2011

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