A Brain-Computer Interface (BCI) is a technology that establishes a direct communication pathway between the brain and an external device, such as a computer or prosthetic limb. BCIs can enable the transmission of information from the brain to the device or vice versa. These interfaces can be invasive, non-invasive, or semi-invasive, and they have potential applications in various fields, including assistive technology, neuroprosthetics, and gaming.

The Argus Implant is a retinal prosthesis developed by the company Second Sight. It is designed to restore partial vision to individuals with certain types of blindness, such as retinitis pigmentosa. The device consists of a small camera mounted on glasses worn by the user, which captures images and sends them to an implanted microelectrode array on the retina. The array stimulates the remaining functional cells in the retina, allowing the user to perceive visual information.

Neuralink is a neurotechnology company co-founded by Elon Musk. The company aims to develop brain-machine interface technologies to enhance human cognition and address neurological conditions. Neuralink's approach involves the development of high-bandwidth brain-machine interfaces, known as Neural Lace, that can facilitate direct communication between the brain and external devices. The technology has potential applications in treating neurological disorders, cognitive enhancement, and even enabling direct communication between individuals and computers.