Improving Peripheral Reading With Noninvasive Transcranial Electrical Stimulation of Early Visual Areas.

Area of Science:

• Neuroscience
• Ophthalmology
• Cognitive Science

Background:

• Peripheral vision is susceptible to crowding, impacting tasks like reading.
• Noninvasive transcranial electrical stimulation (tES) targets the primary visual cortex.
• tES, including transcranial direct current stimulation (tDCS) and transcranial random noise stimulation (tRNS), may mitigate visual crowding.

Purpose of the Study:

• To investigate the effects of tDCS and tRNS on reading performance in peripheral vision.
• To determine if noninvasive visual cortex stimulation can reduce limitations imposed by visual crowding.

Main Methods:

• A double-blind, placebo-controlled study with 41 healthy adults.
• Participants underwent active or sham tDCS (n=21) or tRNS (n=20) sessions.
• Reading accuracy of sentences presented peripherally was measured before, during, and after stimulation.

Main Results:

• Transcranial random noise stimulation (tRNS) resulted in a significant improvement in reading performance (P = 0.035).
• Transcranial direct current stimulation (tDCS) did not show a significant effect on reading performance.
• Significant within-session learning effects were observed across all conditions (P = 0.001).

Conclusions:

• Noninvasive stimulation of the visual cortex, specifically tRNS, can enhance visual processing.
• These findings support the potential application of tES in vision rehabilitation strategies.
• Noninvasive brain stimulation may complement existing treatments for retinal and macular diseases by improving visual input processing.