Related Experiment Video
Updated: Jun 27, 2025
07:29
A Novel Approach for Documenting Phosphenes Induced by Transcranial Magnetic Stimulation
Published on: April 1, 2010
12.1K
A Phosphenotron Device for Sensoric Spatial Resolution of Phosphenes within the Visual Field Using Non-Invasive
Faraz Sadrzadeh-Afsharazar1, Alexandre Douplik1,2
1Photonics Group, Department of Physics, Faculty of Science, Toronto Metropolitan University (Formerly Ryerson University), Toronto, ON M5B 2K3, Canada.
Sensors (Basel, Switzerland)
|April 27, 2024
Summary
Non-invasive transcranial alternating current stimulation (NITACS) can reliably generate phosphenes, which are visual perceptions of light. This technology offers a promising, non-invasive method for modulating visual perception and aiding visual impairments.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Ophthalmology
Background:
- Phosphenes are perceptions of light without external stimuli.
- Previous methods for phosphene induction were often invasive.
- Enhancing spatial resolution of phosphenes is key for visual aid development.
Purpose of the Study:
- To assess the spatial resolution of phosphenes induced by non-invasive transcranial alternating current stimulation (NITACS).
- To evaluate NITACS as a tool for modulating visual perception.
- To establish optimal parameters for NITACS-induced phosphene generation.
Main Methods:
- Utilized a novel electrode arrangement around the eye orbits for NITACS.
- Tested eight participants, assessing phosphene patterns and stability.
- Employed Receiver Operating Characteristics analysis to quantify performance.
Main Results:
- NITACS successfully generated spatially defined phosphene patterns within participants' visual fields.
- Phosphene characteristics varied individually but were stable across stimulations.
- Optimal parameters for phosphene induction without discomfort were identified.
Conclusions:
- NITACS is a reliable and non-invasive method for inducing phosphenes.
- This technique shows potential for advancing visual aid technology and neuroscience research.
- Further development could lead to new ways to modulate visual perception.
