Many people who have a traumatic brain injury (TBI) - usually from a blow to the head such as in a vehicle collision or in a fall do not survive or, if they do, suffer from long-term disability. Previous studies have shown that about 1,000 people in Australia and New Zealand suffer a moderate or severe TBI every year. With current best available treatment and therapies many of these patients sustain loss of brain function and long term disability in varying degrees.