SCIENTISTS have developed a breakthrough technology: a temporary tattoo that can be printed directly onto the scalp to measure brainwaves. This innovation provides a non-invasive and comfortable alternative to traditional EEG methods, revolutionising brain activity monitoring and brain-computer interface (BCI) applications.
Electroencephalography (EEG) is crucial for diagnosing neurological conditions such as epilepsy and brain injuries. However, traditional EEG systems rely on manually attached electrodes and conductive gels, which are uncomfortable, time-intensive, and prone to signal degradation over prolonged use. To overcome these challenges, researchers developed a conductive liquid ink that can flow through hair and dry into an ultra-thin film. Using a microjet printer, custom e-tattoo electrodes were precisely applied to the scalps of five participants. These electrodes, which recorded brainwaves with minimal noise, demonstrated stable connectivity for at least 24 hours—far surpassing the performance of traditional electrodes, which began failing after six hours. The team also printed conductive lines to replace EEG wires, achieving a semi-wireless system.
This approach combines biocompatible ink, advanced digital printing, and tailored sensor design to create personalised, hair-friendly sensors. The method is painless, requires no physical contact, and produces high-quality, long-term brain activity data. In addition to clinical diagnostics, this technology could significantly enhance BCIs by enabling seamless integration of brain monitoring systems directly onto the scalp.
In conclusion, this innovation offers a transformative solution for clinical and research practices involving EEG and BCIs. By eliminating the discomfort and limitations of traditional systems, this technology paves the way for user-friendly, precise, and long-lasting brain monitoring. Future developments aim to achieve fully wireless systems, further expanding its potential applications in prosthetics, virtual reality, and neurological rehabilitation.
Katrina Thornber, EMJ
Reference
Scalco de Vasconcelos L et al. On-scalp printing of personalized electroencephalography e-tattoos. Cell Biomaterials. 2024;0:100004.
