Discrete eye-position recording for alternative communication

Area of Science:

• Biomedical Engineering
• Rehabilitation Technology
• Human-Computer Interaction

Background:

• Effective communication is crucial for individuals with severe motor impairments.
• Existing assistive communication technologies may have limitations in speed or control.
• Eye-tracking offers a potential non-invasive interface for communication.

Purpose of the Study:

• To investigate the feasibility of using Electro-Oculo-Graphy (EOG) for a two-step direct-selection communication system.
• To develop and evaluate a system that translates eye movements into communication signals.
• To explore the potential of this technology in rehabilitation settings.

Main Methods:

• Measuring saccade magnitude at a specific time (Ts) after initiation.
• Comparing saccade magnitude to adjustable reference potentials using a multicomparator.
• Classifying EOG signals within a range to a central reference potential band.
• Utilizing a visual feedback system with light sources and an automatic reset circuit.
• Allowing slow pursuit eye/head movements below saccade trigger velocity for user freedom.

Main Results:

• Demonstrated the feasibility of a two-step EOG-controlled communication system.
• Successfully classified eye positions into discrete vertical bands.
• Implemented a feedback mechanism for user confirmation.
• Showcased the potential for user control with limited eye/head movements.

Conclusions:

• A two-step direct-selection communication system using EOG with discrete vertical eye positions is a viable approach.
• The developed saccade-discretisator shows promise for application in rehabilitation.
• Further development could enhance usability and expand applications for individuals with disabilities.