Adaptation to Phosphene Parameters Based on Multi-Object Recognition Using Simulated Prosthetic Vision.
Retinal prostheses for the restoration of functional vision are under development and visual prostheses targeting proximal stages of the visual pathway are also being explored. To investigate the experience with visual prostheses, psychophysical experiments using simulated prosthetic vision in normally sighted individuals are necessary. In this study, a helmet display with real-time images from a camera attached to the helmet provided the simulated vision, and experiments of recognition and discriminating multiple objects were used to evaluate visual performance under different parameters (gray scale, distortion, and dropout). The process of fitting and training with visual prostheses was simulated and estimated by adaptation to the parameters with time. The results showed that the increase in the number of gray scale and the decrease in phosphene distortion and dropout rate improved recognition performance significantly, and the recognition accuracy was 61.8 ± 7.6% under the optimum condition (gray scale: 8, distortion: k = 0, dropout: 0%). The adaption experiments indicated that the recognition performance was improved with time and the effect of adaptation to distortion was greater than dropout, which implies the difference of adaptation mechanism to the two parameters.
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Peng
P
Xia
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Jie
J
Hu
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Yinghong
Y
Peng
D000222:Adaptation, Physiological; D000328:Adult; D004192:Discrimination, Psychological; D005260:Female; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual; D010719:Phosphenes; D010775:Photic Stimulation; D021641:Recognition, Psychology; D012160:Retina / Q000502:physiology*; D014792:Visual Acuity; D014796:Visual Perception; D057488:Visual Prosthesis; D055815:Young Adult
Neuroplasticity; Object recognition; Psychophysics; Retinal prostheses; Simulated prosthetic vision