Contribution of visual velocity and displacement cues to human balancing of support surface tilt
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- 作者：Lorenz Assl?nder (1) (2)
Georg Hettich (1) (2)
Albert Gollhofer (2)
Thomas Mergner (1) - 关键词：Humans ; Posture control ; Multisensory integration ; Visual velocity cues ; Stroboscopic illumination
- 刊名：Experimental Brain Research
- 出版年：2013
- 出版时间：July 2013
- 年：2013
- 卷：228
- 期：3
- 页码：297-304
- 全文大小：423KB
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Georg Hettich (1) (2)
Albert Gollhofer (2)
Thomas Mergner (1)
1. Neurocenter, Neurological University Clinic, Breisacher Str. 64, 79106, Freiburg, Germany
2. Institute for Sport and Sportscience, University of Freiburg, Schwarzwaldstr. 175, 79117, Freiburg, Germany
文摘
Vision helps humans in controlling bipedal stance, interacting mainly with vestibular and proprioceptive cues. This study investigates how postural compensation of support surface tilt is compromised by selectively reducing visual velocity cues by stroboscopic illumination of a stationary visual scene. Healthy adult subjects were presented with pseudorandom tilt sequences in the sagittal plane (tilt frequency range 0.017-.2?Hz; velocity amplitude spectrum constant up to a frequency of 0.6?Hz, angular displacement amplitude spectrum increasing with decreasing frequencies). Center of mass (COM) sway responses were recorded for stroboscopic illuminations at 48, 32, 16, 8, and 4?Hz, as well as under continuous illumination and with eyes closed. With strobe duration (5?ms) and mean luminance (1?lx) kept constant, visual acuity and perceived brightness remained constant and the visual scene was perceived as stationary. Yet, tilt-evoked COM excursions increased with decreasing strobe frequency in a graded way, with largest effects occurring at tilt frequencies where large tilt velocities coincided with small displacements. In addition, COM excursions were reduced at the lowest strobe frequency compared to eyes closed, with the largest effect occurring at tilt frequencies where tilt displacements were large. We conclude that two mechanisms exist, a velocity mechanism that deals with tilt compensation and is foremost affected by the stroboscopic illumination and a displacement mechanism. This compares favorably to previous findings that, transferred to a stance control model, suggest a velocity mechanism for tilt compensation and a position mechanism for gravity compensation.