Augmented Reality (AR) combines real-world and computer-generated data, allowing for a dynamic presentation of visual contents while moving in the physical surroundings. Though promising for the investigation of visuospatial processing in natural scenarios, experimental research exploiting AR in this context is scarce. In this study, we aimed at testing the behavioral consequences of multitasking when walking in different directions to close landmarks while responding to AR holograms outdoors. Participants were engaged in i) a visual single-task for discriminating augmented peripheral targets, ii) a navigation single-task consisting of a sequence of short goal-directed walking periods to close augmented landmarks and iii) a dual-task combining the latter tasks. We evaluated the cost of dual-tasking on cognitive and motor performance in comparison to the single-tasks, along with a subjective assessment of mental load. Cognitive-Motor Interference (CMI) was highlighted by performance costs in both the cognitive and motor domains under dual-task. Interestingly, a discrepancy between subjective and objective measures of mental load under dual-task was observed. We conclude that the attentional load induced by multitasking can have important consequences when navigating the dynamic real world, and thus needs to be addressed in a variety of daily-living contexts. In this perspective, AR is a suitable research tool for simulating dynamic tasks outdoors, enhancing the ecological validity of cognitive investigations without sacrificing the experimental rigor of laboratory research. Additionally, it provides insights into the possible impact on attention and behavior when using wearable mobile technologies that overlap virtual data to the physical environment.

增强现实（AR）结合了真实世界和计算机生成的数据，可以在物理环境中移动时动态呈现视觉内容。尽管有希望在自然场景下进行视觉空间处理的研究，但在这种情况下利用AR进行实验的研究却很少。在这项研究中，我们旨在测试多任务处理的行为后果，即在不同方向行走以关闭地标并响应户外AR全息图时的行为后果。参与者进行了以下工作：i）视觉上的单个任务，用于区分增强的外围目标； ii）导航单任务，该任务由一系列短目标定向的步行时间序列组成，以闭合增强的地标； iii）双重任务，结合了后者。我们评估了双任务与单任务相比在认知和运动表现上的成本，以及主观的精神负荷评估。在双任务下，认知和运动领域的性能成本突显了认知运动干扰（CMI）。有趣的是，观察到双任务下心理负荷的主观和客观测量之间存在差异。我们得出的结论是，在动态的现实世界中导航时，由多任务引起的注意力负荷可能会产生重要的后果，因此需要在各种日常生活环境中进行处理。从这个角度来看，AR是一种适合在户外模拟动态任务，在不牺牲实验室研究实验严格性的情况下提高认知研究的生态有效性的合适研究工具。此外，