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Direction Dependence of the Perception of the Support Rotation While Quiet Standing

정적서기 상태에서 지지면 회전 인지능력의 방향별 차이

  • Jeon, H.J. (School of Biomedical Engineering, Konkuk Univ) ;
  • Heo, J.H. (School of Biomedical Engineering, Konkuk Univ) ;
  • Jeon, H.M. (School of Biomedical Engineering, Konkuk Univ) ;
  • Yun, J.S. (School of Biomedical Engineering, Konkuk Univ) ;
  • Kweon, Y.R. (School of Biomedical Engineering, Konkuk Univ) ;
  • Eom, G.M. (School of Biomedical Engineering, Konkuk Univ)
  • Received : 2016.08.22
  • Accepted : 2017.03.20
  • Published : 2017.04.30

Abstract

The purpose of this study was to investigate the effect of direction (pitch and roll) on the perception of support surface rotation while standing. Thirty young healthy subjects participated in this study. Support surface was rotated at an unexpected instant in a very slow speed (0.2 deg/s). The direction of support surface rotation was randomly chosen among pitch (forward and backward) and roll (right and left) directions. The experiment was performed with eyes open and closed. Perception performance was evaluated by the perception threshold, defined as the rotation angle of the surface at the instant when a subject recognized that the support surface was moving. Results showed that the perception threshold was smaller for roll directions than pitch directions irrespective of vision and gender (p < 0.01). This indicates that the perception of support surface rotation is more sensitive in roll direction than in pitch direction. Among three sensory functions related to postural perception, the effect of vestibular and visual functions on the direction difference of the perception should be little because of the very slow surface rotation and independence on visual conditions. Therefore, the direction dependence of perception would have been affected mainly by the somatosensory function.

Keywords

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