This study examined the influence of visual information of different complexities and predictability on the body sway of individuals with Parkinson's disease (PD) during upright stance. Twenty-one individuals at initial stages of PD (62.1 ± 7.2 years), under dopaminergic medication, and 21 controls (62.3 ± 7.1 years) stood inside a moving room, performing 10 trials of 60 s. In the first trial, the room remained motionless. Then, the room oscillated in an anterior-posterior direction. There were three blocks of three trials. In the first block, the room oscillated at 0.2 Hz (periodic simple condition); in the second block, periodic frequencies of 0.1, 0.3, and 0.5 Hz were combined (periodic complex condition); in the third block, non-periodic frequencies of 0.1, 0.3, and 0.5 Hz were combined (non-periodic complex condition). Participants were not informed about the room movement. The displacement of the room and trunk were registered using an OPTOTRAK system. Postural sway was examined using mean sway amplitude, and the relationship between visual information and body sway used coherence, gain, and phase. There was no group difference when the room remained motionless. Upon visual manipulation, the PD group displayed larger sway magnitude in the non-periodic complex condition. Individuals with PD also lagged behind the moving room (lower phase values) compared to controls, only in the periodic simple condition. In the remaining measures, there was no group difference. These results suggest that individuals with PD use complex and unpredictable visual information, similar to controls, during upright stance. However, PD might affect the predictable visual cues processing.

本研究检查了不同复杂性和可预测性的视觉信息对帕金森病 (PD) 患者在直立站立时身体摇摆的影响。21 名处于 PD 初始阶段（62.1 ± 7.2 岁）、接受多巴胺能药物治疗的个体和 21 名对照组（62.3 ± 7.1 岁）站在一个移动的房间内，进行 10 次 60 秒的试验。在第一次审判中，房间一动不动。然后，房间在前后方向震荡。有三块三个试验。在第一个块中，房间以 0.2 Hz 的频率振荡（周期简单条件）；在第二个区块中，组合了 0.1、0.3 和 0.5 Hz 的周期频率（周期复数条件）；在第三个块中，组合了 0.1、0.3 和 0.5 Hz 的非周期频率（非周期复数条件）。参与者没有被告知房间的移动。使用 OPTOTRAK 系统记录房间和行李箱的位移。使用平均摇摆幅度检查姿势摇摆，并且使用相干性、增益和相位来检查视觉信息和身体摇摆之间的关系。当房间保持静止时，没有组间差异。在视觉操作下，PD 组在非周期性复杂条件下显示出更大的摇摆幅度。与对照组相比，PD 个体也落后于移动房间（较低的相位值），仅在周期性简单条件下。在其余措施中，没有组差异。这些结果表明，PD 患者在直立站立时使用复杂且不可预测的视觉信息，类似于对照组。然而，