South Korean researchers have developed an ultra-thin transparent neural electrode capable of transmitting light to the brain while recording neural signals [1].
This advancement represents a significant step toward restoring sight for the blind by allowing artificial visual stimuli to reach the brain without blocking the recording of neural activity.
The research team addressed a common technical hurdle where transparency often compromises electrical conductivity. To solve this, they applied gold atoms to the electrode surface in a thin, even layer [1]. This process reduced the gold film thickness from 100 nanometers to 10 nanometers [1].
The resulting electrode has an overall thickness of four micrometers [1]. According to reporter Lim Neul-sol, the device allows more than 65% of light to pass through while maintaining the electrical signal measurement performance of existing technology [1].
In experiments involving blind mice, the team used the electrode to induce artificial visual responses. The results showed a 78% similarity to the responses seen in mice with normal vision [1].
Lim said the electrode's transparency is key to its functionality, as it allows for the simultaneous delivery of light and the monitoring of the brain's reaction [1].
“The device allows more than 65% of light to pass through while maintaining electrical signal performance.”
The ability to simultaneously stimulate the brain with light and record the resulting electrical activity is critical for the development of high-fidelity brain-machine interfaces. By achieving high light transmission and significant similarity to natural visual responses in animal models, this technology provides a potential blueprint for future medical implants designed to treat profound blindness.
