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Performance Evaluation of a Mobile Touchscreen Interface for Assistive Robotic Manipulators: A Pilot Study.

Cheng-Shiu Chung1,2, Hyun W Ka1,2, Hongu Wang1,2

  • 1Human Engineering Research Laboratories, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.

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A new touchscreen mobile user interface (UI) for assistive robotic manipulators (ARMs) offers easier learning and better performance for individuals with spinal cord injury compared to traditional joystick controls.

Keywords:
assistive technologyroboticstask performancetouchscreenwheelchairs

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Area of Science:

  • Robotics
  • Human-Computer Interaction
  • Rehabilitation Engineering

Background:

  • Assistive robotic manipulators (ARMs) aim to enhance independence for individuals with spinal cord injury (SCI) during daily activities.
  • Current commercial ARM user interfaces (UIs) can be challenging to learn and operate.
  • A novel touchscreen mobile UI was developed to address these limitations.

Purpose of the Study:

  • To compare the performance of a new touchscreen mobile UI against a traditional joystick UI for ARMs.
  • To evaluate user preference and task efficiency between the two ARM interfaces.

Main Methods:

  • A pilot study involving 8 participants with upper extremity impairments.
  • Participants were trained on both touchscreen and joystick ARM UIs.
  • Performance was assessed using the ARM evaluation tool (ARMET) with tasks including switch flipping, handle pushing, and knob turning.
  • Outcome measures included task completion time, mean velocity, and qualitative feedback.

Main Results:

  • Seven out of eight novice participants preferred the touchscreen UI over the joystick.
  • All participants successfully completed ARMET tasks independently with both UIs.
  • The touchscreen UI demonstrated superior performance, indicated by faster task completion times and higher mean moving speeds.

Conclusions:

  • The mobile touchscreen ARM UI provides a more accessible and user-friendly experience.
  • It requires less physical effort and results in improved task performance.
  • This suggests the touchscreen UI is a potentially efficient tool for enhancing ARM usability for individuals with SCI.