A rat maze experiment managed to replace the sense of sight in blind rats with an artificial one:  a microchip compass that told them when they were pointed north or south.  The brain prosthetic allowed them to learn a maze as well as seeing rats.

I wrote this article for the Evansville Courier and Press, so you have to go there to read it.

The original published paper for the study is also available:  Current Biology 25, April 20, 2015