Vibert N, Hoang T, Gilchrist D P D, MacDougall H G, Burgess A M, Roberts R D, Vidal P P, Curthoys I S
Laboratoire de Neurobiologie des Réseaux Sensorimoteurs, CNRS UMR 7060-Université René Descartes (Paris 5), Centre Universitaire des Saints-Pères, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France.
Gait Posture. 2006 Apr;23(3):355-63. doi: 10.1016/j.gaitpost.2005.04.006. Epub 2005 Jun 1.
We recently conducted experiments where 24 seated participants were subjected (with eyes closed) to small amplitude, high-jerk impulses of linear acceleration. Responses were distributed as a continuum between two extremes. The "stiff" participants showed little movement of the head relative to the trunk, whereas the "floppy" participants showed a large head rotation in the direction opposite the sled movement. We hypothesized that the stiff behavior resulted from the spontaneous use of an imagined visual frame of reference and undertook this larger-scale study to test that idea. The distribution along the "stiff-floppy" continuum was compared with the scores on psychophysiological tests measuring vividness of imagery, visual field-dependence and motion sickness susceptibility. Multivariate regression analysis revealed that the "stiffness" of individuals was loosely, but significantly related to the vividness of their imagery. However, "stiffness" was not linked to visual field-dependence or motion sickness susceptibility. Even if it explains only 20% of the variance of the data, the increase of "stiffness" with vividness of imagery fits our hypothesis. With eyes closed, stiff people may use imagined external visual cues to stabilize their head and trunk. Floppy people, who are poorer imagers, may rely more on "egocentric", proprioceptive and vestibular inputs.
我们最近进行了一些实验，让24名坐着的参与者（闭眼）接受小幅度、高加速度的线性冲击。反应分布在两个极端之间的连续体上。“僵硬”的参与者头部相对于躯干的移动很小，而“松弛”的参与者头部则在与雪橇运动相反的方向上有较大的转动。我们假设僵硬行为是由于自发使用了想象中的视觉参照系，并进行了这项更大规模的研究来验证这一想法。将沿着“僵硬-松弛”连续体的分布与测量意象生动性、视野依赖性和晕动病易感性的心理生理测试分数进行了比较。多元回归分析表明，个体的“僵硬程度”与他们意象的生动性有松散但显著的关系。然而，“僵硬程度”与视野依赖性或晕动病易感性无关。即使它只解释了数据方差的20%，“僵硬程度”随意象生动性的增加也符合我们的假设。闭眼时，僵硬的人可能会使用想象中的外部视觉线索来稳定他们的头部和躯干。意象较差的松弛的人可能更多地依赖“以自我为中心的”本体感觉和前庭输入。
