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Judgments of eye level in light and in darknessSubjects judged eye level in the light and in the dark by raising and lowering themselves in a dental chair until a stationary target appeared to be at the level of their eyes. This method reduced the possibility of subjects' using visible landmarks as reference points for setting eye level during lighted trials, which may have contributed to artificially low estimates of the variability of this judgment in previous studies. Chair settings were 2.5 deg higher in the dark than in the light, and variability was approximately 66 percent greater in the dark than in the light. These results are discussed in terms of possible interactions of two separate systems, one sensitive to the orientations of visible surfaces and the other sensitive to bodily and gravitational information.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Stoper, Arnold E.
(California State University Hayward, United States)
Cohen, Malcolm M.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Perception and Psychophysics
Volume: 40
Issue: 5, 19
ISSN: 0031-5117
Subject Category
Behavioral Sciences
Accession Number
Distribution Limits

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