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Optical specification of time-to-passage: Observers' sensitivity to global tauDespite its general mathematical formulation, most empirical work on the visual perception of tau (defined as a quantity divided by its temporal derivative) has focused on the case of direct approach, with tau defined as image angle/rate of expansion. Empirical investigators tend to generalize image size analyses to off-axis approaches. However, this generalization is inappropriate for all but a few classes of objects. After mathematically reestablishing the appropriate optical cues specifying time to passage for noncollision cases, we report a series of studies in which we examined observers' sensitivities to this information in both relative- and absolute-judgment paradigms. In general, we found observers' judgments to be accurate and robust.
Document ID
19950033904
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kaiser, Mary K.
(NASA Ames Research Center Moffett Field, CA, United States)
Mowafy, Lyn
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Journal of Experimental Psychology: Human Perception and Performance
Volume: 19
Issue: 5
ISSN: 0096-1523
Subject Category
Behavioral Sciences
Accession Number
95A65503
Distribution Limits
Public
Copyright
Other

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