Cursor Click Modality in an Accelerometer-Based Computer Access Device.

Area of Science:

• Human-Computer Interaction
• Assistive Technology
• Biomedical Engineering

Background:

• Alternative computer access methods are crucial for individuals with motor impairments.
• Head-tilt control using accelerometry is a viable cursor movement technique.
• Effective and efficient click modalities are essential for optimizing alternative access performance.

Purpose of the Study:

• To investigate the performance of different cursor click modalities in an alternative computer access system.
• To compare dwell-based clicks with surface electromyography (SEMG)-based clicks (blink and brow raise) for head-tilt cursor control.

Main Methods:

• Eighteen healthy adults performed a target acquisition task using a head-tilt controlled cursor.
• Five click modalities were tested: three dwell-based (0.5s, 1.0s, 1.5s) and two SEMG-based (blink, brow raise).
• Performance was assessed via target selection accuracy, path efficiency, selection time, and user effort.

Main Results:

• SEMG-based click modalities demonstrated performance comparable to dwell-based clicks.
• SEMG clicks matched the speed of the shortest dwell time and the accuracy of the longest dwell time.
• SEMG-based clicks significantly minimized user effort compared to dwell-based methods.

Conclusions:

• Surface electromyography-based click modalities are a promising alternative for computer access.
• SEMG clicks offer a balance of speed, accuracy, and reduced user effort in head-tilt control systems.
• Further research is needed to validate these findings in populations with neuromuscular disorders.