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Translation and Rotation Trade Off in Human Visual Heading EstimationWe have previously shown that, during simulated curvilinear motion, humans can make reasonably accurate and precise heading judgments from optic flow without either oculomotor or static-depth cues about rotation. We now systematically investigate the effect of varying the parameters of self-motion. We visually simulated 400 ms of self-motion along curved paths (constant rotation and translation rates, fixed retinocentric heading) towards two planes of random dots at 10.3 m and 22.3 m at mid-trial. Retinocentric heading judgments of 4 observers (2 naive) were measured for 12 different combinations of translation (T between 4 and 16 m/s) and rotation (R either 8 or 16 deg/s). In the range tested, heading bias and uncertainty decrease quasilinearly with T/R, but the bias also appears to depend on R. If depth is held constant, the ratio T/R can account for much of the variation in the accuracy and precision of human visual heading estimation, although further experiments are needed to resolve whether absolute rotation rate, total flow rate, or some other factor can account for the observed -2 deg shift between the bias curves.
Document ID
20020038807
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Stone, Leland S.
(NASA Ames Research Center Moffett Field, CA United States)
Perrone, John A.
(Waikato Univ. Hamilton, New Zealand)
Null, Cynthia H.
Date Acquired
August 20, 2013
Publication Date
January 1, 1996
Subject Category
Behavioral Sciences
Meeting Information
Meeting: Association for Research in Vision and Opthalmology Meeting
Location: Fort Lauderdale, FL
Country: United States
Start Date: April 21, 1996
End Date: April 26, 1996
Sponsors: Association for Research in Vision and Opthalmology
Funding Number(s)
PROJECT: RTOP 199-16-12-37
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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