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 Physics and Astronomy Particle Accelerators |
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Optical and Event-Duration Variables Affecting Self-Motion Perception
Authors: Dean H. Owen; OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS |
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Abstract: This paper includes four experiment sections. The first pair of experiments investigated the usefulness of optical flow acceleration in detecting descent. When sink rate and ground speed are constant, optical flow accelerates. Holding fractional loss in altitude constant throughout a descent event also holds flow rate invariant, eliminating flow acceleration as a potential source of information. Detection of descent was accomplished easily without flow acceleration, and it was found that at least one of the remaining functional optical variables specifying fractional loss in altitude must be highly salient. Also, the effect of optical texture density was optimal when linkages with other relevant variables were taken into account. The third experiment compared eyeheight and ground-unit size as metrics for global optical information specifying descent. Given that flow acceleration is not an essential source of information, the study focused on eyeheight-scaled change in optical splay and ground-unit-scaled change in optical density as functional specifiers of fractional loss in altitude. The fourth experiment investigated the interation between global optical flow rate and duration of a constant-speed preview period. Of particular interest was the possibility that preview periods of different durations would differentially favor or interfere with sensitivity given particular optical conditions, e.g., different flow rates. The results indicate that this is a complex issue. The fifth experiment assessed the effect of preview period on sensitivity to different fractional losses in altitude.
| Description: |
Interim paper Jan 84-Apr 85 |
| Pages: |
198 |
| Report Date: |
NOV 85 |
| Contract Number: |
F33615-83-K-0038 |
| Report Number: |
A638161 |
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