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Time-to-Collision (TTC) judgements with offsize objects show that Tau needs to be intergrated with familiar size to explain TTC performance

Hosking, Simon and Crassini, Boris 2003, Time-to-Collision (TTC) judgements with offsize objects show that Tau needs to be intergrated with familiar size to explain TTC performance, in Studies in perception and action VII : twelfth International conference on perception and action, July 13-18, 2003, Gold Coast, Queensland, Australia, Lawrence Erlbaum Associates, Mahwah, N.J., pp. 51-51.

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Title Time-to-Collision (TTC) judgements with offsize objects show that Tau needs to be intergrated with familiar size to explain TTC performance
Author(s) Hosking, Simon
Crassini, Boris
Conference name International Conference on Perception and Action (12th : 2003 : Gold Coast, Qld.)
Conference location Gold Coast, Qld.
Conference dates 13-18 Jul. 2003
Title of proceedings Studies in perception and action VII : twelfth International conference on perception and action, July 13-18, 2003, Gold Coast, Queensland, Australia
Editor(s) Rogers, Sheena
Effken, Judy
Publication date 2003
Start page 51
End page 51
Publisher Lawrence Erlbaum Associates
Place of publication Mahwah, N.J.
Summary Observers judged TTC with computer-generated displays simulating an approaching object in three familiar-size conditions:

(i) Real-size (smaller, larger objects depicted as tennis, soccer balls respectively).
(ii) Off-size (smaller, larger objects depicted as soccer, tennis balls respectively).
(iii) Ambiguous-size (smaller, larger objects depicted as texture-less black balls of different size).

Displays simulated objects approaching observersí viewpoint from 24.96 m, and disappearing at 5.76 m. Manipulation of approach velocities (4.8-19.2 msec-1) produced viewing times from 1.0 to 4.0 sec, and delays between object disappearance and tau-based TTC ranging from 0.3 to 1.2 sec. Motion characteristics of smaller and larger objects in the three familiar-size conditions simulated those of approaching real-sized tennis and soccer balls respectively; that is, for each approach velocity, tau‚-based TTC was the same across the three conditions for smaller and larger objects.

Results showed that, consistent with the proposition of tau-determined TTC, TTC estimates in the real-size condition were uninfluenced by object size. This is contrary to previous reports that TTC for larger objects is underestimated relative to TTC for smaller objects. However, such size-dependent TTC differences were found in the ambiguous-size condition, with even larger differences in the off-size condition; TTCs for the ëlargerí tennis ball were much less than TTCs to the ësmallerí soccer ball compared to corresponding TTCs in the ambiguous-size condition. These results are problematic for the proposition that tau solely determines TTC. We discuss the role of perceptual learning in resolving this problem.
ISBN 0805848053
9780805848052
Language eng
Field of Research 170112 Sensory Processes, Perception and Performance
Socio Economic Objective 970117 Expanding Knowledge in Psychology and Cognitive Sciences
HERDC Research category E3 Extract of paper
Persistent URL http://hdl.handle.net/10536/DRO/DU:30014009

Document type: Conference Paper
Collection: School of Psychology
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