BCI and the future of VR:
http://www.darpa.mil/news-events/2015-01-19
http://www.darpa.mil/about-us/bridging-the-bio-electronic-divide
>New effort aims for fully implantable devices able to connect with up to one million neurons

http://www.darpa.mil/news-events/2016-02-08
http://www.darpa.mil/about-us/less-invasive-neural-interface
>Minimally Invasive “Stentrode” Shows Potential as Neural Interface for Brain

https://www.youtube.com/watch?v=F_brnKz_2tI
>The Mind-Controlled Bionic Arm With a Sense of Touch

http://www.darpa.mil/news-events/2017-07-10
https://www.youtube.com/watch?v=vjac3RBoK1c
>Neural Engineering System Design program sets out to expand neurotechnology capabilities and provide a foundation for future treatments of sensory deficits

Outdated but relevant:
https://www.google.com/patents/US6729337
>Method and system for generating sensory data onto the human neural cortex

http://www.technewsworld.com/story/42081.html
>Sony Patent Details 'Matrix'-Like Brain Stimulation System

https://www.wireheading.com/misc/matrix.html
>Sony patent takes first step towards real-life Matrix

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3428140/
>Non-invasive transcranial stimulation of rat abducens nerve by focused ultrasound

http://www.nature.com/nature/journal/v530/n7588/full/nature16492.html
>Bioresorbable silicon electronic sensors for the brain

http://www.nature.com/nbt/journal/v34/n3/full/nbt.3428.html
>Minimally invasive endovascular stent-electrode array for high-fidelity, chronic recordings of cortical neural activity