EFFECT OF LINEAR ACCELERATION ON COGNITION OF GRAVITATIONAL AXIS AND HORIZONTAL AXIS
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概要
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Objective : The objective of the study was to elucidate the effect of linear acceleration on spatial orientation, especially on cognition of the gravitational axis and the horizontal axis, while the otolith organ was subjected to continuous loading by linear acceleration in bilateral directions, alternately.<BR>Methods : A linear accelerator was used to apply continuous sinusoidal loading in the Z axial direction (i.e., stimulation of the saccules) and the Y axial direction (i.e., stimulation of the utricles) with the experimental subject in a supine position. To measure cognition of the gravitational axis and the horizontal axis, a liquid crystal display was used to project two points on the wall facing the experimental subject these two points were then rotated around the experimental subject using a joystick. The experimental subject was then instructed to imagine a line which would connect the two points, and to indicate the gravitational axis and the horizontal axis. The effects of Z or Y axial direction loading on the cognition of the gravitational axis direction and the horizontal axis direction were then determined.<BR>Results : Regarding the cognition of the gravitational axis, there was a tendency for the error in the angle to be larger in response to loading in the Z axial direction, compared with loading in the Y axial direction. Regarding the cognition of the horizontal axis, there was no difference between loading in the Z axial direction and loading in the Y axial direction.<BR>Conclusions : Loading in the Z axial direction by means, of repeated stimulation of the otolith organ (mainly the saccules), which is the primary sensor of the gravitational axis, by linear acceleration reduced the experimental subject's cognition of the gravitational axis. This result suggests that the otolith may be involved in the establishment of spatial orientation.
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