Neurogenesis is an umbrella term for technology which directly modifies the brain, ranging from modifying it for better scan coherence, regenerating tissue, all the way to integrating computational materials in it. Originally referring to the process by which neurons are produced by neural stem cells, it began to be associated with optogenetic neural lace and the retro-viral delivery of bio-coherent material into the brain pioneered by Nexus, as well as the later development in replacement of parts of the brain with smart polymers.