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Space vehicle approach velocity judgments under simulated visual space conditionsThirty-five volunteers responded when they first perceived an increase in apparent size of a collimated, 2-D image of an Orbiter vehicle. The test variables of interest included the presence of a fixed angular reticle within the field of view (FOV); three initial Orbiter distances; three constant Orbiter approach velocities corresponding to 1.6, 0.8, and 0.4 percent of the initial distance per second; and two background starfield velocities. It was found that: (1) at each initial range, increasing approach velocity led to a larger distance between the eye and Orbiter image at threshold; (2) including the fixed reticle in the FOV produced a smaller distance between the eye and Orbiter image at threshold; and (3) increasing background star velocity during this judgment led to a smaller distance between the eye and Orbiter image at threshold. The last two findings suggest that other detail within the FOV may compete for available attention which otherwise would be available for judging image expansion; thus, the target has to approach the observer nearer than otherwise if these details were present. These findings are discussed in relation to previous research and possible underlying mechanisms.
Document ID
19880009710
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Haines, Richard F. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1987
Subject Category
Behavioral Sciences
Report/Patent Number
NAS 1.15:89437
NASA-TM-89437
A-87136
Accession Number
88N19094
Funding Number(s)
PROJECT: RTOP 482-52-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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