Holograms projected onto brain cells could help replace lost senses and EDIT our memories

A device that projects holograms onto brain cells could one day help replace lost senses and change our memories. The system, which uses flashes of light to control neurons, can trick the brain into thinking it is experiencing something it isn't. The technology could be used to treat post-traumatic stress disorder by changing a person's recollection of events. Researchers say it could also someday'allow the blind to see or the paralysed to feel touch'. The aim of the device is to read neural activity constantly and decide, based on that activity, which sets of neurons to activate in order to replace lost sensations.