Post-Rotatory effects on attitude perception during rolling manoeuvre


  1. Howard, I.P.
  2. Palmisano, S.
  3. Hu, G.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Institute for Space and Terrestrial Science, North York ONT (CAN)
Spatial disorientation has been identified as major causes of avaiation accidents. One cause of spatial disorientation is an aftereffect of returning the body to a vertical posture after having maintained it for some time in a non-vertical posture. However, investigations into the nature of these aftereffects have frequently produced conflicting results. The experiments in Part A of the current study were designed to resolve several controversial issues by examining the effects of duration of body tilt and speed of return to vertical on the setting of a tactile rod to vertical. Judgments of tactile vertical became more erroneous as the duration of the adaptation tilt increased. Importantly, while tactile vertical was overestimated when subjects were held at the adaptation tilt, it was underestimated following their rotation back to vertical or 10 degrees from vertical. This finding suggests that two distinct processes are involved in errors of the subject vertical-one based on aftereffects of subjecting the otolith organs to a displaced direction of gravity and another based on aftereffects of rotary acceleration acting on the vestibular canals. A second cause of disorientation in pilots arises from conflicts between information from the gravity sense organs and from vision. TRUNCATED
Spatial disorientation;Sensory physiology;Attitude perception;Rolling maneuvers
Report Number
DCIEM-CR-2000-085 — Contractor Report
Date of publication
15 Mar 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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