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Implantable Chip Measures and Adjusts Dopamine Levels in Mouse Brain – IEEE Spectrum.

Researchers have created an implantable chip that detects and adjusts dopamine levels in mice brains by tracing the neurotransmitter itself rather than relying on electrical signals, as most brain implants do. When the levels drop below a defined point, the device automatically sends an electrical impulse to prod neurons to release more.
Pedram Mohseni, an electrical engineer at Case Western Reserve University who led the project, likens it to a home thermostat. “A thermostat basically monitors the temperature and it turns on or off to regulate the temperature,” he says. “Our device operates the same way.”

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Mice getting all the new toys… Proof of concept paper here.