Time-to-Collision (TTC) judgements with offsize objects show that Tau needs to be intergrated with familiar size to explain TTC performance
Contribuinte(s) |
Rogers, Sheena Effken, Judy |
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Data(s) |
01/01/2003
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Resumo |
Observers judged TTC with computer-generated displays simulating an approaching object in three familiar-size conditions:<br /><br />(i) Real-size (smaller, larger objects depicted as tennis, soccer balls respectively).<br />(ii) Off-size (smaller, larger objects depicted as soccer, tennis balls respectively).<br />(iii) Ambiguous-size (smaller, larger objects depicted as texture-less black balls of different size).<br /><br />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.<br /><br />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.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Lawrence Erlbaum Associates |
Relação |
http://dro.deakin.edu.au/eserv/DU:30014009/crassini-timetocollision-2003.pdf http://www.trincoll.edu/depts/ecopsyc/isep/ICPA-conf/abstracts.html |
Tipo |
Conference Paper |