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Simulation-Based Clarification of Appropriate Factors for Presenting Phosphene in Two Directions Avoiding Electrical
Manami Kanamaru1, Phan Xuan Tan1, Eiji Kamioka1
1Graduate School of Engineering and Science, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
Bioengineering (Basel, Switzerland)
|August 26, 2021
Summary
This study explores using phosphene stimulation for obstacle detection in walking support systems for the blind. Anti-phase electrical stimulation effectively controls phosphene position without interference, enabling multi-directional visual field representation.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Assistive Technology
Background:
- Walking support systems are crucial for enhancing mobility and independence in blind individuals.
- Phosphene perception, the sensation of light without actual light stimulus, is a promising method for obstacle detection.
- Current systems face challenges in presenting phosphenes in multiple directions without electrical interference.
Purpose of the Study:
- To investigate methods for controlling phosphene position for obstacle detection in walking support systems.
- To explore techniques for presenting phosphenes in multiple visual field directions without electrical interference.
- To clarify optimal stimulation factors for accurate phosphene positioning via electrical field simulation.
Main Methods:
- Simulated the electrical field on the eyeball surface to analyze phosphene position control.
- Investigated the effect of electrode distance and alternating current phase on the electric field.
- Focused on anti-phase stimulation as a potential method for multi-directional phosphene presentation.
Main Results:
- Electrode distance showed no significant effect on the electric field distribution on the eyeball surface.
- Alternating current phase was identified as a critical factor influencing the electric field.
- Anti-phase stimulation demonstrated control over the electric field, enabling phosphene transition in the visual field.
Conclusions:
- Anti-phase stimulation is an effective method for controlling electric field distribution on the eyeball surface.
- This technique allows for the controlled presentation of phosphenes in at least two directions.
- The findings pave the way for developing advanced walking support systems with improved obstacle detection capabilities for the visually impaired.
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