Sorry, i hadn't read the actual paper until now. Actually they did use transgenic GM mice, which allow the expression of rhodopsin in activated cells. While the

Sorry, i hadn't read the actual paper until now. Actually they did use transgenic GM mice, which allow the expression of rhodopsin in activated cells. While the title of the article is not very revealing, it's pretty close to what they did, although by no means did they "use lasers to implant a memory", they used a lot of other stuff too.