 With sensory input and motor nerves tied into a computer they serve as starship pilots (or colony administrators), seeing and feeling the colony or ship as an extension of their own body.They perform this job to pay off their debt for education and hardware, and continue as free agents once the debt is paid.To compensate for the Brains' inability to move within human habitats they are paired with partners known as "Brawns", who are trained in a wide array of skills (including the protection of their Brain counterparts).