Text-to-brain literature? Herff et. al. demonstrate in "Brain-to-text: decoding spoken phrases from phone representations in the brain" a brain-to-text system to map intracranial electrocorticographic recordings to text. 

I've been looking for literature attempting to go the other direction, text-to-brain, but have not had much luck finding anything on Springer, Google Scholar, and related services. 

For someone in the know, what's the current state of the text-to-brain problem?
We don't have a well tested or accepted model of how specific items are encoded in the cortex, so text to brain is still far off. However, it is possible to send information to the brain.

Ramirez et al. 2013. Creating a False Memory in the Hippocampus

This study (in mice) involved creating a false sense of fear associated with a particular context. This implanted information is much higher level than just text, but it is still information.