A new neurostimulator developed by engineers at UC Berkeley (UCBerk) can listen to and stimulate electric current in the brain at the same time, potentially delivering fine-tuned treatments to patients with diseases like epilepsy and Parkinson’s. The device, named the WAND, works like a 'pacemaker for the brain', monitoring the brain’s electrical activity and delivering electrical stimulation if it detects something amiss. These devices can be extremely effective at preventing debilitating tremors or seizures in patients with a variety of neurological conditions. But the electrical signatures that precede a seizure or tremor can be extremely subtle, and the frequency and strength of electrical stimulation required to prevent them are equally touchy. It can take years of small adjustments by doctors before the devices provide optimal treatment.