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VISUAL LOCALIZATION OF THE HORIZONTAL AS A FUNCTION OF BODY TILT UP TO = 90 DEGREES FROM GRAVITATIONAL VERTICAL,
NAVAL SCHOOL OF AVIATION MEDICINE PENSACOLA FLA
Pagination or Media Count:
The visual horizontal was determined for three sophisticated subjects tilted laterally in 10 degrees intervals within 90 degrees from gravitational vertical. The task had adequate intratest reliability, but there were considerable interest and intrasubject quantitative variations. Visual localization as a function of body tilt, however, was qualitatively similar among all subjects and among the thirteen test sessions of each subject. Around upright there was a range totaling 20 - 40 degrees on the average of body positions in which the deviation was not significant from that of upright. Inclinations beyond this range caused the E-phenomenon to appear and increase bilaterally up to a maximum of about the 40 - 50 degrees position with further inclination the deviation reversed direction and passed through the position 60 - 80 degrees of zero deviation to grow as the A-phenomenon. Responses were bilaterally symmetrical in certain respects for each of the subjects. The variable error among all subjects followed a similar curvilinear function of body attitude. Repetition of test without immediate knowledge of results did not as a rule end in reduction of errors. Author
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