Role of gravity-based information on the orientation and localization of the perceived body midline
Role of gravity-based information on the orientation and localization of the perceived body midline
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DOI：
10.1007/s00221-006-0764-4
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发表时间：
2007-01-01
影响因子：
2
通讯作者：
Trousselard, Marion
中科院分区：
文献类型：
--
作者：
Ceyte, Hadrien;Cian, Corinne;Trousselard, Marion
本研究的重点是基于重力的信息对感知身体中线的方向和定位的影响。通过在受试者的 Z 轴上滚动调整杆以及通过视点水平调整为正前方进行定位来研究方向。实验 1 通过将受试者置于翻滚倾斜和仰卧姿势来研究 Z 轴和重力方向之间分离的影响。在侧倾倾斜中，对身体中线方向的感知在身体倾斜的方向上发生偏差，而对其定位的感知在相反的方向上发生偏差。在仰卧身体方向时，Z 轴和直线前方的估计与身体直立时一样保持真实。实验 2 强调了使用扩散压力刺激的耳石和触觉信息的相对重要性。对身体中线方向的估计进行了与其定位的估计相反的修改。因此，受试者对他们的自我中心空间没有绝对的表征。关于身体中线的方向和定位之间的分离的主要假设可能与感觉信息整合的差异有关。可以认为，前庭眼反射（VOR）的水平分量有助于身体中线的感知定位，而其方向主要受触觉信息的影响。
The present study focused on the influence of gravity-based information on the orientation and localization of the perceived body midline. The orientation was investigated by the rolling adjustment of a rod on the subjects' Z-axis and the localization by the horizontal adjustment of a visual dot as being straight ahead. Experiment 1 investigated the effect of the dissociation between the Z-axis and the direction of gravity by placing subjects in roll tilt and supine postures. In roll tilt, the perception of the body midline orientation was deviated in the direction of body tilt and the perception of its localization was deviated in the opposite direction. In the supine body orientation, estimates of the Z-axis and straight-ahead remained veridical as when the body was upright. Experiment 2 highlighted the relative importance of the otolithic and tactile information using diffuse pressure stimulation. The estimation of body midline orientation was modified contrarily to the estimation of its localization. Thus, subjects had no absolute representation of their egocentric space. The main hypothesis regarding the dissociation between the orientation and localization of the body midline may be related to a difference in the integration of sensory information. It can be suggested that the horizontal component of the vestibulo-ocular reflex (VOR) contributed to the perceived localization of the body midline, whereas its orientation was mainly influenced by tactile information.