Brain chip tracks drug effects live: KAIST implant measures the messenger acetylcholine
A wireless implant from South Korea measures the neurotransmitter acetylcholine in the brain and can stimulate nerve cells with light. It was tested in minipigs and mice – not in humans.
Archive image · Photo: Dr.aleks (en.wikipedia) / Wikimedia Commons, CC BY 2.5 (cropped and resized)
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) and partner institutes have developed an implantable neural chip that tracks changes in the brain in real time. It measures the neurotransmitter acetylcholine electrochemically, can stimulate nerve cells with light via a micro-LED and transmits the data via Bluetooth. The study was published on 14 October in the journal Device (Cell Press).
The sensing layer combines porous chitosan with silver-platinum nanowires. In minipigs, the chip was implanted in the prefrontal cortex; after the Alzheimer's drug donepezil was given, the acetylcholine signal rose and then gradually returned to baseline. In transgenic mice, light stimulation increased acetylcholine signals.
The study did not show a therapeutic effect against Alzheimer's or an improvement in memory; according to KAIST, further validation is needed before any use in humans. Project lead Kyung-In Jang, professor of mechanical engineering, sees the work as groundwork for technologies that monitor changes in the brain. Jang is also CEO of N-Side, a start-up he founded.
Sources
- EurekAlert! / KAIST – KAIST uses wireless neural chip to track brain changes in real time after Alzheimer’s drug administration (26.10.2026)
- Device (Cell Press) – Implantable neural chip with electrochemical sensing and optogenetic stimulation for monitoring of cholinergic pharmacological responses (14.10.2026), DOI 10.1016/j.device.2026.101329