Brain-Computer Interface is a communication system that enables direct interaction between the human brain and an external device, such as a computer or a prosthetic device, without the need for any muscular or peripheral nerve activity. The basic principle behind a BCI is to measure or record brain activity, analyze the signals, and translate them into commands or actions that can be interpreted by a computer or a device. This is typically done by using sensors or electrodes placed on the scalp (non-invasive) or implanted directly into the brain (invasive) to detect electrical or neural activity. Invasive neural prostheses are a kind of BCI, where the electrodes are implanted in the brain. Insight into the interaction between such implants and the brain tissue will help maximize the potential of the technology.