Direct brain implants will allow to enter virtual reality at any time

Ray Kurzweil : writer, futurist
Direct brain implants will allow users to enter full-immersion virtual reality - with complete sensory stimulation and without any external equipment. People will be able to have their minds in a totally different place at any moment. This technology will be in widespread use.

Kurzweil, Ray. 1999. The age of spiritual machines: when computers exceed human intelligence. New York: Viking.