The Impact of Navigation Aids on Search Performance and Object Recall in Wide-Area Augmented Reality

Title of the Paper

The Impact of Navigation Aids on Search Performance and Object Recall in Wide-Area Augmented Reality

Paper Information

• Subject Area: Augmented Reality (AR), User Interaction, Navigation Aids
• Keywords: Mobile Augmented Reality, Wide-Area Search, Navigation Aids, User Study, Attention Behavior, Object Recall, Test Design

Research Background and Problem

• Problem or Challenge:
  In wide-area augmented reality (AR) scenarios, users face complex search tasks involving both physical and virtual targets. In such complex environments, effectively guiding users to complete tasks while enhancing their awareness of the real environment remains an unresolved research challenge. The use of head-mounted devices introduces potential side effects, such as reduced attention to the physical environment and decreased multitasking capabilities.

• Research Significance:
  Augmented reality has been widely applied in mobile navigation (e.g., Google Maps Live View) and professional fields (e.g., rescue operations, education). However, research on how to optimally present navigation information in outdoor wide-area scenarios remains relatively insufficient. Understanding the impact of navigation aids on user behavior and perception is crucial for developing effective augmented reality applications.

• Research Motivation and Related Work:
  Previous studies have primarily focused on controlled indoor environments or AR implemented through mobile devices. In wide-area scenarios, aspects such as navigation visualization methods, distraction (attention dispersion) factors, and the perception of environmental objects require further investigation. Additionally, existing research has shown that different visual cues (e.g., radar, arrows) vary in their effectiveness in navigation tasks but have not thoroughly explored their detailed impact on attention allocation between physical and virtual objects.

Solution

• Proposed Method:
  This paper designs and conducts a user experiment to compare the effects of three different types of augmented reality navigation aids (radar, compass, and world-anchored arrows in head-mounted devices) on user performance in wide-area search tasks and attention allocation. The experiment includes object search tasks, auditory response tasks, and object recall tests.

• Innovations:

  1. A comprehensive comparison of screen-stabilized navigation aids (radar, compass) and world-anchored navigation aids (world-anchored arrows).
  2. Investigation of not only the impact of navigation aids on search task performance but also their influence on users' attention allocation to physical and virtual objects and their multitasking capabilities.
  3. Conducting experiments in real outdoor scenarios, addressing the limitations of previous studies conducted mainly in controlled indoor environments.

• Implementation Steps and Key Techniques:

  1. Experiment Design: Includes three navigation aids (arrows, radar, compass) and a control condition without aids.
  2. Task Content:
     • Search and classify gems distributed in the environment ("gem search task").
     • Simultaneously complete an auditory response task to measure users' cognitive load.
     • Conduct a post-experiment object recall task, requiring users to classify real or virtual objects in the environment.
  3. Data Collection and Analysis: Using Microsoft Hololens-2 to track users' head positions, eye movements, gem classification accuracy, etc., combined with subjective user feedback and statistical analysis methods.

Research Results

• Specific Findings:

  1. Search Task Performance:
     • All three navigation aid conditions significantly improved search performance, reducing task completion time compared to the no-aid condition.
     • World-anchored arrows performed best in terms of speed and user preference scores during early tasks.
  2. User Preferences:
     • Users showed a clear preference for world-anchored arrows, followed by the compass and radar, and were least satisfied with the no-aid condition.
  3. Attention to the Physical Environment:
     • When using navigation aids, users' recall accuracy for physical environment objects was significantly lower than for virtual objects, indicating a noticeable reduction in awareness of the physical environment.
  4. Multitasking Impact:
     • Performance on secondary tasks (auditory tasks) significantly declined when using the compass, suggesting it may increase cognitive load.

• Advantages Over Existing Research:

  • Extends navigation aid research to real wide-area outdoor AR scenarios, providing analysis more aligned with practical application contexts.
  • Focuses on attention allocation between physical and virtual objects, revealing potential conflicts between multitasking and navigation.

• Experimental or Evaluation Results:

  • Under navigation aid conditions, users' efficiency in search tasks was significantly higher than in the control group, with world-anchored arrows performing the best.
  • The compass and radar guided users to focus more on screen information, but at the cost of reduced attention to the external environment.
  • Nighttime navigation tasks (low light conditions) had additional effects on certain task performances (e.g., total distance traveled).

• Limitations and Future Directions:

  1. Limitations:

     • World-anchored arrow navigation may be affected by physical obstructions.
     • Screen-stabilized navigation aids may lead to excessive cognitive load, such as the jitter effect of the compass.
     • Eye-tracking calibration for participants in this experiment may have lagged.

  2. Future Directions:

     • Improve navigation aid designs (e.g., introducing X-ray vision to overcome occlusion issues).
     • Further study how to balance virtual task efficiency with physical environment awareness.
     • Explore ways to enhance users' multitasking abilities and reduce cognitive load in wide-area scenarios.