Simulation-Based Clarification of Appropriate Factors for Presenting Phosphene in Two Directions Avoiding Electrical Interference
Abstract
:1. Introduction
2. Background Knowledge
2.1. Stimulus Factors for Human Head
2.2. Phosphene Presentation
2.3. Simulation Tool of the Electric Field for Human Head Model
3. Evaluation Method for Avoiding the Electric Interference While Presenting Phosphene in Two Directions
- Verify how much electrical interference due to the distance between the electrodes affects the transition of the electric field on the eyeball surface. The electrode placements are designed to gradually make the distance between the electrodes larger.
- Clarify how to simultaneously present the phosphene in two directions of the visual field while avoiding electrical interference. The electrode placements that stimulate intended regions on the eyeball surface reported in the previous study are applied in the simulation.
3.1. The Simulation Conditions
3.2. Summarization of the Evaluation Method
4. Evaluation
4.1. Electric Interference Due to the Distance of the Electrodes
- When two pairs of electrodes’ placements are used under the same phase condition, the effect of electrical interference can be seen. However, the value does not fluctuate significantly within the region of the eyeball surface.
- When a single pair of electrodes is used under the anti-phase condition, the same result as the norm value of the electric field under the same phase condition is shown.
- When two pairs of electrodes’ placements are used under the anti-phase conditions, the electric field values near the center point between the electrodes are canceled out due to the electrical interference.
- The transition waveform and the peak position of the electric field are not changed due to the stimulation current intensity, which is irrespective of the electrode placements.
- The electric field value with 2 mA is twice that of the one with 1 mA.
- The coordinates of the peak position are not changed due to the influence of electrical interference, only the norm value of the electric field is changed.
4.2. The Effect of Electric Interference with Presenting the Phosphene at Two Directions
5. Discussion
- Stimulate only the right eyeball when presenting the phosphene in the “right/center direction” and stimulate only the left eyeball when presenting the phosphene in the “center/left direction.”
- Set the stimulation current intensity of the electrode that presents the phosphene toward the center of the visual field higher than the other electrodes.
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Tissues | Electrical Conductivity |
---|---|
White matter | 0.027656 |
Gray Matter | 0.027512 |
CSF 1 | 2.0000 |
Bone | 0.020028 |
Head skin | 2.0000 × |
Eye ball | 0.41113 |
Electrode Placement | The Potential Position of the Phosphene in the Visual Field |
---|---|
i | Right hand of the visual field |
ii | Central visual field |
iii | Central visual field |
iv | Left hand of the visual field |
I | Right and left hand of the visual field |
II | Right and center of the visual field |
III | Center and left of the visual field |
Electrode Placement | Coordinate of the Electrode on the Forehead | Coordinate of the Electrode on the Cheek | Coordinate of the Electrode on the Other Forehead | Coordinate of the Electrode on the Other Cheek |
---|---|---|---|---|
1 | (−56.65, 68.06, 31.40) | (−45.91, 77.21, −35.86) | - | - |
2 | (−41.17, 81.53, 31.84) | (−45.91, 77.21, −35.86) | - | - |
3 | (−20.83, 88.39, 35.82) | (−45.91, 77.21, −35.86) | - | - |
4 | (55.27, 69.06, 27.18) | (44.43, 76.69, −36.22) | - | - |
5 | (37.57, 83.32, 30.48) | (44.43, 76.69, −36.22) | - | - |
6 | (19.97, 89.36, 35.38) | (44.43, 76.69, −36.22) | - | - |
7 | (19.97, 89.36, 35.38) | (44.43, 76.69, −36.22) | (−20.83, 88.39, 35.82) | (−45.91, 77.21, −35.86) |
8 | (37.57, 83.32, 30.48) | (44.43, 76.69, −36.22) | (−20.83, 88.39, 35.82) | (−45.91, 77.21, −35.86) |
9 | (55.27, 69.06, 27.18) | (44.43, 76.69, −36.22) | (−20.83, 88.39, 35.82) | (−45.91, 77.21, −35.86) |
10 | (55.27, 69.06, 27.18) | (44.43, 76.69, −36.22) | (−41.17, 81.53, 31.84) | (−45.91, 77.21, −35.86) |
11 | (37.57, 83.32, 30.48) | (44.43, 76.69, −36.22) | (−41.17, 81.53, 31.84) | (−45.91, 77.21, −35.86) |
12 | (19.97, 89.36, 35.38) | (44.43, 76.69, −36.22) | (−41.17, 81.53, 31.84) | (−45.91, 77.21, −35.86) |
13 | (19.97, 89.36, 35.38) | (44.43, 76.69, −36.22) | (−56.65, 68.06, 31.40) | (−45.91, 77.21, −35.86) |
14 | (37.57, 83.32, 30.48) | (44.43, 76.69, −36.22) | (−56.65, 68.06, 31.40) | (−45.91, 77.21, −35.86) |
15 | (55.27, 69.06, 27.18) | (44.43, 76.69, −36.22) | (−56.65, 68.06, 31.40) | (−45.91, 77.21, −35.86) |
Electrode Placement | Coordinate of the Electrode on the Forehead | Coordinate of the Electrode on the Cheek | Coordinate of the Electrode on the Other Forehead | Coordinate of the Electrode on the Other Cheek |
---|---|---|---|---|
i | (62.68, 57.05, 27.99) | (44.43, 76.69, −36.22) | - | - |
ii | (23.16, 88.73, 34.62) | (51.05, 66.06, −59.22) | - | - |
iii | (−24.47, 88.32, 33.67) | (−53.77, 65.46, −56.93) | - | - |
iv | (−64.06, 54.13, 28.95) | (−45.91, 77.21, −35.86) | - | - |
I | (62.68, 57.05, 27.99) | (44.43, 76.69, −36.22) | (−64.06, 54.13, 28.95) | (−45.91, 77.21, −35.86) |
II | (62.68, 57.05, 27.99) | (44.43, 76.69, −36.22) | (−24.47, 88.32, 33.67) | (−53.77, 65.46, −56.93) |
III | (23.16, 88.73, 34.62) | (51.05, 66.06, −59.22) | (−64.06, 54.13, 28.95) | (−45.91, 77.21, −35.86) |
Point on the Eyeball Surface | Coordinate of Each Point |
---|---|
Point 1 | (42.09, 67.86, 3.46) |
Point 2 | (39.46, 69.97, 4.62) |
Point 3 | (37.15, 70.94, 7.02) |
Point 4 | (33.36, 70.69, 10.94) |
Point 5 | (30.51, 71.00, 6.57) |
Point 6 | (24.51, 70.50, 7.92) |
Point 7 | (23.71, 70.62, 6.51) |
Point 8 | (−0.05, 87.00, 4.83) |
Point 9 | (−23.92, 67.85, 3.6) |
Point 10 | (−26.97, 69.96, 6.29) |
Point 11 | (−32.52, 71.87, 8.17) |
Point 12 | (−36.13, 70.88, 10.3) |
Point 13 | (−39.46, 71.41, 3.32) |
Point 14 | (−41.73, 70.19, 2.63) |
Point 15 | (−43.71, 67.36, 2.24) |
Phosphene Presentation Position | Appropriate Electrode Placement | Current Intensity | Phase Condition |
---|---|---|---|
right/left direction | Electrode (I), which stimulates temporal side of both eyeballs | 1 mA | Anti-phase |
right/center direction | The electrode placements which stimulate only the right eyeball | 1 mA | Same-phase |
The electrode placements which stimulate the temporal side of the right eyeball and the vicinity of the center of the left eyeball surface | Vicinity of the center: 1.5 mA Temporal side: 1 mA | Anti-phase | |
center/left direction | The electrode placements which stimulate only the left eyeball | 1 mA | Same-phase |
The electrode placements which stimulate the temporal side of the left eyeball and the vicinity of the center of the right eyeball surface | Vicinity of the center: 1.5 mA Temporal side: 1 mA | Anti-phase |
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Kanamaru, M.; Tan, P.X.; Kamioka, E. Simulation-Based Clarification of Appropriate Factors for Presenting Phosphene in Two Directions Avoiding Electrical Interference. Bioengineering 2021, 8, 111. https://doi.org/10.3390/bioengineering8080111
Kanamaru M, Tan PX, Kamioka E. Simulation-Based Clarification of Appropriate Factors for Presenting Phosphene in Two Directions Avoiding Electrical Interference. Bioengineering. 2021; 8(8):111. https://doi.org/10.3390/bioengineering8080111
Chicago/Turabian StyleKanamaru, Manami, Phan Xuan Tan, and Eiji Kamioka. 2021. "Simulation-Based Clarification of Appropriate Factors for Presenting Phosphene in Two Directions Avoiding Electrical Interference" Bioengineering 8, no. 8: 111. https://doi.org/10.3390/bioengineering8080111