Supplemental Digital Content is Available in the Text. Background and Purpose: Persons with vestibular disorders are known to have slower gait speed with greater imbalance and veering during dual-task walking than healthy individuals, but the cerebral mechanisms are unknown. The purpose of this study was to determine whether individuals with visual vertigo (VV) have different cerebral activation during dual-task walking compared with control subjects. Methods: Fourteen individuals with VV and 14 healthy controls (CON) were included (mean 39 years old, 85% women). A cross-sectional experimental study consisting of 4 combinations of 2 surfaces (even and uneven) and 2 task conditions (single- and dual-task) was performed. Participants walked over an even (level flooring) or uneven (wood prisms underneath carpeting) surface, either quietly or while reciting every other letter of the alphabet. Changes in cerebral activation over the bilateral prefrontal cortices were recorded using functional near-infrared spectroscopy during 4 task conditions relative to quiet standing. Gait speed and cognitive performance were recorded. Results: There were no between-group differences in cognitive performance. Both groups slowed when walking on an uneven surface or performing a dual-task; participants in the VV group walked more slowly than those in the CON group in all conditions. Participants with VV had decreased cerebral activation in the bilateral prefrontal regions in comparison to CON participants in all conditions. Discussion and Conclusions: Participants with VV had lower prefrontal cortex activation than CON participants during dual-task walking. Lower cortical activity in those with VV may be due to shifted attention away from the cognitive task to prioritize maintenance of dynamic balance. Video Abstract available for more insights from the authors (see the Video, Supplemental Digital Content 1, available at: http://links.lww.com/JNPT/A303).

中文翻译：

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有和没有视觉眩晕的个体在双任务行走期间皮质激活的变化

补充数字内容在文本中可用。背景和目的：已知与健康人相比，患有前庭疾病的人在双任务行走期间步态速度较慢，不平衡和转向更大，但大脑机制尚不清楚。本研究的目的是确定与对照组相比，视觉眩晕 (VV) 个体在双任务行走期间是否具有不同的大脑激活。方法：纳入 14 名 VV 患者和 14 名健康对照（CON）（平均 39 岁，85% 为女性）。进行了由 2 个表面（均匀和不均匀）和 2 个任务条件（单任务和双任务）的 4 种组合组成的横截面实验研究。参与者走过平坦（水平地板）或不平坦（地毯下方的木棱镜）表面，无论是安静地还是在背诵字母表中的所有其他字母时。在相对于安静站立的 4 种任务条件下，使用功能近红外光谱记录了双侧前额叶皮质的大脑激活变化。记录步态速度和认知表现。结果：认知表现没有组间差异。在不平坦的表面上行走或执行双重任务时，两组都放慢了速度；在所有条件下，VV 组的参与者都比 CON 组的参与者走得更慢。与所有条件下的 CON 参与者相比，VV 参与者的双侧前额叶区域的大脑激活减少。讨论和结论：在双任务行走期间，VV 参与者的前额叶皮层激活低于 CON 参与者。VV 患者的皮层活动较低可能是由于将注意力从认知任务转移到优先维持动态平衡。视频摘要可从作者那里获得更多见解（参见视频，补充数字内容 1，可在以下网址获取：http://links.lww.com/JNPT/A303）。