Wearable health sensors are becoming increasingly common, but current versions are difficult to wear. For example, devices attached to the face can draw unwanted attention, increase self-consciousness, and affect the very signals the user is trying to measure. However, recent research may have found a solution to these problems by introducing ultra-thin sensors that are invisible to the observer and invisible to the wearer.
In a recently published article scientific progressResearchers at the University of Tokyo’s Institute of Industrial Science and a joint research institute have reported the development of thin, stretchable on-skin electrodes that are virtually invisible when worn on the face. This new technology can measure biological signals that cannot be detected by sight or touch, enabling monitoring under more natural conditions.
Biosignals such as eye movements, facial muscle activity, and brain activity provide valuable information for medical monitoring and human-machine interaction. However, traditional facial electrodes can change a person’s appearance, affect social interactions, and create so-called appearance artifacts, changes in behavior or psychological state caused by simply wearing a device that can be seen by individuals and others.
To truly integrate wearable electronics into everyday life, they must fade into the background. People should be able to wear sensors without feeling like they are being watched, judged, or uncomfortable. ”
Naoji Matsuhisa Senior author
The new electrode achieves this by combining several design features, including an ultrathin elastic film about 200 nanometers thick and transparent conductive nanowires. The resulting device closely matches the appearance and texture of natural skin, reducing reflections and eliminating the shiny appearance that often makes wearable electronics stand out.
“In our experiments, neither the wearer nor an external observer could reliably detect the electrodes by sight or touch,” said first author Yijun Liu. “The device is comfortable and breathable during use, and accommodates a wide range of skin tones and characteristics.”
The important thing is that the electrode still performs its intended function. Using these electrodes, the research team was able to record electrooculogram signals from eye movements, electromyogram signals from facial muscles, and electroencephalogram signals from brain activity. For some signal types, the signal quality was clearly better than that obtained using conventional gel electrodes due to the lower skin impedance.
“Creating fully functional and virtually invisible wearable electronics brings us one step closer to a future where health monitoring and human-machine interaction are seamlessly integrated into everyday life,” said Matsuhisa.
The research team believes future applications for the company’s sensors could include subtle monitoring of emotional states and cognitive functions, as well as new ways to control devices and virtual reality systems using eye movements and facial expressions. More broadly, such invisible sensors could help create a future in which technology adapts seamlessly to people. Not the other way around.
sauce:
Institute of Industrial Science, University of Tokyo
Reference magazines:
Ryu, Y. others. (2026) Reducing appearance artifacts in wearable skin surface electronics. scientific progress. DOI: 10.1126/sciadv.aee6417. https://www.science.org/doi/10.1126/sciadv.aee6417
