Spiral Wearable Monitors Brain Activity From Inside Ear Canal

Researchers at Tsinghua University developed new BCI applications.

Image credit: Nature Communications

Brain-computer interfaces (BCIs) often include scalp-applied or even brain-implanted electrodes, serving a variety of beneficial applications. However, if a new, less intrusive BCI is required, it can easily be inserted into the patient's ear canal.

The SpiralE is an experimental device created by a group of researchers from Tsinghua University in China. It is a tiny multilayered rectangular strip that is just 50 mm long and 3 mm broad, comprised of two shape-memory polymer layers, one electrothermal actuation layer, and one EEG(electroencephalogram) layer. The corkscrew-like initial twist of the strip makes it possible to put it quickly and readily into the patient's broader ear canal.

Once the device is in place, an electrical field outside of it is exposed to it, which causes a Joule heating process to occur in the electrothermal actuation layer. The shape-memory polymers in the strip try to return to a flat, uncurled condition as a result of the heat produced, reports New Atlas.

As a result, the strip begins to uncurl, but the inner ear canal walls continue to hold it in a less tightly curled position. Thus, where it can easily pick up electrical impulses from the brain, its EEG electrode layer is placed up against the skin of the ear canal.

Related: Tiny Wireless Battery-Free Implant for Optogenetics Illuminates Neuron Activity in the Brain

The device was shown to be pleasant to wear for extended periods of time in lab tests, and it demonstrated up to 95% accuracy in detecting volunteers' brain activity. The researchers are hopeful that it may eventually be put to use in applications like monitoring patients' sleep patterns or identifying epilepsy or tiredness.

The study team believes that the SpiralE's simplicity of usage may pave the way for new BCI applications. They foresee the creation of software tools that can translate entire ideas into writing, command virtual and actual world things, and possibly even create enhanced memories.

Sam Draper
August 3, 2023

Innovation of the Month

Do you want to discover more, visit the website
Visit Website

Other news

Reducing White Matter Atrophy in Alzheimer’s Patients

Cognito's gamma sensory stimulation can help to reduce white matter atrophy in the brain.

Total Brain Joins AMA to Study Uses of Heart Rate Variability Data to Reduce Stress and Cardiovascular Incidents

Neuroscience-based mental health and fitness platform Total Brain.

Second-Gen Hand Tracking Camera From Ultraleap

Ultraleap has launched its second-generation hand-tracking camera called Leap Motion Controller 2.

Hearables are the Most Popular Choice of Wearables Among Consumers, Says IDC Report

Wireless earbuds, better known as hearables, are fast replacing wearables as the most...
Discover more