Title page for ETD etd-11102009-020033
|Type of Document
||Adams, William F.
||The effects of target vibration on the human contrast sensitivity function
||Master of Science
|Prestrude, Albert M.
|Conners, Richard W.
|Crawford, Helen J.
- Contrast sensitivity (Vision)
|Date of Defense
A great deal of research has been conducted on the effects of
vibration on visual acuity. The human contrast sensitivity function
(CSF) has also been studied extensively as a predictor of visual
performance under real-world conditions. However, no previous studies
have combined the two lines of research and examined the effect of
vibration on the CSF. Prior research indicates that increasing rates of
vibration correspond to a decrease in traditional measures of visual
acuity. However, other studies indicate that motion enhances target
detection. The present study examined the effects of vibration upon the
CSF and found that vibration lowers the threshold of detection for low
spatial frequencies but raises the threshold for high spatial
frequencies. A loss of contrast at high spatial frequencies due to
retinal "smear" may be the cause of this increase in high spatial
frequency thresholds under vibration. Physiological mechanisms of
motion detection, direction selectivity, and visual pathways are also
discussed. This study may have important implications for aerospace
medicine and occupations which demand viewing a target or instrument
panel under conditons of vibration.
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