Seoul National University scientists have revealed a pair of safe, transparent, organic light-emitting diode (OLED) glasses that use flickering light stimulation (FLS) to improve brain function through a promising process called gamma wave entrainment.
The team behind the gamma wave brain entrainment glasses said scientists have previously identified FLS as a possible way to improve brain function in patients suffering from Alzheimer’s disease (AD) and everyday people; however, finding a safe, biocompatible solution for everyday use has proved challenging.
Now, Hyeonwook Chae and colleagues have developed a safe, transparent, functional design that improved entrainment in initial trials and is ready for further clinical trials to explore its potential to improve cognitive performance.
Supercharging the Brain’s Performance via Gamma Wave Entrainment
According to a recent study detailing the new glasses, gamma wave entrainment is an electrical state where brainwaves from different regions become synchronized “to a high-frequency gamma oscillation.” Some early studies have linked this synchronized state, which promotes improved communication between brain regions, with improvements in memory and focus in early-stage Alzheimer’s disease.
“Preclinical studies have revealed that flickering light stimulation (FLS) at specific frequencies can entrain gamma rhythms, influencing neural processes involved in memory, attention, and sensory processing,” Chae and colleagues explain.
Those same efforts have revealed that FLS can modulate the amyloid proteins associated with AD. The researchers said this combination of potential benefits makes using FLS to initiate brain wave entrainment “a promising tool for addressing conditions like mild cognitive impairment (MCI), a precursor to more severe cognitive decline and affecting brain activity in ways that could delay or mitigate cognitive deterioration.”
Still, the South Korea University team notes, finding a way to deliver effective FLS to human eyes “in a comfortable fashion” has limited its wider therapeutic applications.
“For everyday treatment, a light source system that maintains visibility while delivering effective stimulation is essential for patient comfort and practicality,” they explained.
Transparent OLEDs Successfully Demonstrated as a Practical FLS Source
After investigating different options, the researchers decided to create a specialized pair of glasses using transparent OLEDs. In theory, the design would deliver FLS at the level needed to produce gamma wave entrainment while also permitting an unobstructed view in ambient light conditions, a qualification that has limited other FLS treatment options.
To test the transparent OLED glasses’ basic safety and ability to induce gamma wave entrainment, the team enlisted several volunteers to try them out. When tested under real-world conditions, with and without ambient light, the team said the glasses “successfully induced gamma rhythm entrainment, enhancing brain connectivity between the occipital and frontal regions.”
Somewhat fortuitously, the researchers found that the FLS-induced gamma wave entrainment and connectivity were stronger in the transparent system under ambient lighting, while also producing the least side effects, such as eye strain or “dazzling.” They were also described as the most comfortable in the most optimized design, and the most likely to be adopted for everyday use.
“Their see-through characteristics, high performance, ‘cold’ operation without hotspots, and excellent uniformity make them a promising solution for wearable light sources for FLS while providing aesthetic appeal as well,” the study authors write, adding that “their ability to maintain transparency while emitting light is an important feature as it allows users to see their surroundings and thus interact seamlessly with them.”
A Noninvasive Wearable Technology for Early Cognitive Intervention
When discussing the implications of their transparent OLED gamma wave entrainment glasses, the study authors said their work can be regarded as “crucial for the induction of gamma rhythms and the promotion of neural connectivity.” They also highlighted the results showing the “strong potential for the development of future brainwave entrainment devices based on gamma rhythm-based interventions, such as wearable light-stimulating devices that may be used toward reduction of AD symptoms.”
“These results highlight the potential of this noninvasive wearable technology for early cognitive intervention, providing comfortable therapeutic light stimulation,” they explained.
The team also pointed to the test device’s beneficial electrical and optical characteristics, which demonstrated the reliability needed for clinical studies.
“By overcoming the technical challenges of transparent OLEDs, particularly their stability and performance in large-area formats, these devices could serve as practical tools for delivering FLS in real-world settings,” they explained. “This would allow users to benefit from gamma entrainment and potential cognitive improvements during everyday activities.”
The study “Wearable transparent OLED glasses for cognitive stimulation: Enhancing brain connectivity through gamma entrainment” was published in Science Advances.
Christopher Plain is a Science Fiction and Fantasy novelist and has spent the last six years as Associate News Editor and Head Science Writer at The Debrief. Follow and connect with him on X, learn about his books at plainfiction.com, or email him at christopher@thedebrief.org