Improvement in reading performance through training with simulated thalamic visual prostheses.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Ophthalmology

Background:

• Simulations of artificial vision aid in visual prosthesis design by assessing subject performance.
• Longitudinal studies quantifying training benefits for post-implantation rehabilitation are scarce.

Purpose of the Study:

• To investigate the effects of an intensive, eight-week training schedule on adaptation to artificial sight using a reading task.
• To quantitatively assess performance changes in simulated artificial vision.

Main Methods:

• Six normal, sighted subjects performed a daily reading task for eight weeks.
• Stimuli included 40 MNREAD-style sentences per session across five font sizes (logMAR 1.0-1.4) and three phosphene patterns (2,000, 1,000, 500).

Main Results:

• Subjects demonstrated improved reading accuracy and increased reading speed, equivalent to a doubling of available phosphenes.
• Initially illegible conditions became functionally readable after training, indicating significant adaptation.
• Training gaps caused temporary decreases in reading speed but not accuracy, suggesting robust learning.

Conclusions:

• Intensive training significantly enhances reading performance in simulated artificial vision.
• Findings support experience-driven neuroplasticity and inform visual prosthesis rehabilitation strategies.
• This research contributes to the development of thalamic visual prostheses.