The surgery was performed by start-up Inner Cosmos, just one of several companies working on technology that can be implanted into the brains of patients.That business has been the subject of some recent controversy, but also claims to have trained monkeys to play video games with their mind.The Inner Cosmos hardware is about the size of a penny and works by sending a pulse through the patient’s left dorsolateral prefrontal cortex, measuring neuronal activity to determine the correct amount of stimulation as it goes.The idea isn’t exactly a new one, given that similar techniques have been used for years to treat epilepsy and Parkinson’s, but treating depression in this way is a pretty fresh idea.Topics: News, Science, Health, Mental Health, Technology, Weird- Elon Musk expects human trials for Neuralink brain implant will start in six months- Depression Is Likely Not Caused By A Chemical Imbalance In The Brain, New Study Finds- World's First Living Robots Are Now Able To Reproduce, Scientists Say- Synthetic embryo with brain and beating heart created in ‘world first’"