A brainship is a fictional concept of an interstellar starship. A brainship is made by inserting the disembodied brain and nervous system of a human being into a life-support system, and connecting it surgically to a series of computers via delicate synaptic connections (a Brain-computer interface.) The brain "feels" the ship (or any other connected peripherals) as part of its own body. Flying, taking off, landing, and controlling all the other features of the ship are as natural as moving, breathing and talking are to an ordinary human. Being wired into a computer speeds their reactions, but still allows their human brains to make intelligent decisions based on calculations.
I remember reading a story about a woman searching for her son's brain, it had been used for an autopilot on an ore ship and she wanted to find it and give it surcease. And I thought what if severely disabled people were given a chance to become starships? So that's how The Ship Who Sang was born.
— Anne McCaffrey, Anne McCaffrey: Heirs to Pern, Locus Magazine 
1965 – Becalmed in Hell, by Larry Niven. This short story was about Eric, an injured man who became a brainship, and his mobile partner Howie. Eric could not take off from the hazardous surface of Venus because he "felt" something wrong with his "wings". Howie had to find a solution before they both died.
1992 – 1994 – Additional Novels, co-written by McCaffrey.
1994 – Starfire board wargame – Alkelda Dawn expansion, originally created in 1979 by Stephen V. Cole.  This "4X" (eXplore, eXpand, eXploit and eXterminate) board wargame simulates space warfare and empire building in the 23rd century. In it, the J'rill are a race of cybernetic brainships. Originally humanoid, their meritocracy needed to process more and more information as their world grew and computerized. Development of Brain-computer interfaces improved their services to society. However, the Directors became more distant from their bodies as technology advanced. Eventually, their bodies required only life support, making them effectively immortal. As they lost their humanity, their policy decisions became heartless, eventually leading to civil war. The J'rill directors suppressing the revolt by destroying nearly all of their subjects.
1. The remaining human physical parts of the fictional brainship (brain, nervous system, possibly others) must be maintained on constant life support. Any interruption is life-threatening.
2. The sheer bulk of a brainship makes it ill-suited to performing certain tasks. To this end, fictional brainships generally have a mobile partner(s).
In McCaffrey's stories the ship's physical component is encased in a "shell" with life support and connections to the ship's computers. The mobile human partner is referred to as a "Brawn", a specially trained companion and aide. In her stories, brain/brawn partnerships can be short-lived and professional, lasting only as long as the mission, or they may be long, deep, meaningful friendships. In some cases, they may fall in love. Brawn obsession was formerly a serious concern, as a love-crazed brawn might have attempted to breach the life-support shell in order to get at the body entombed within, only to kill the person and go mad with grief. This possibility was effectively eliminated by the brainship Hypatia Cade (during the events of the book "The Ship Who Searched") through the invention and creation of human-replica prosthetic bodies that shellpeople could project their consciousness into through short-range, high-bandwidth transmission.
In Niven's story, ambulatory partner Howie found no mechanical reason for brainship Eric's claim of immobility, which was endangering both of their lives. Howie could not examine Eric's physical body without harming him. Eric could not come up with evidence to convince Howie, and had no way to help himself. Howie concluded privately that the problem is psychological, and risked his life with a ruse which enabled Eric to take off. Only when they escape and Eric was checked out by maintenance personnel was the truth discovered.
In the Starfire board game, the J'rill directors destroyed nearly all of their subjects during a revolt/civil war. This also meant loss of materials and repairs for their life support and cybernetic systems. The J'rill spread out into space to conquer star systems for resources. They depended upon drones for ordinary tasks, and remotes for more independent tasks such as combat.
- http://www.larryniven.org – Fan website, sanctioned by Niven
- Haraway, Donna. "A Cyborg Manifesto: Science, Technology, and Socialist-Feminism in the Late Twentieth Century," in Simians, Cyborgs and Women: The Reinvention of Nature. New York: Routledge, 1991: 149–181.
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