Previous research has highlighted the importance of executive functioning for an individual's functional outcome following acquired brain injury (ABI). However, this thesis found that motivational and emotional processes (known as hot executive functioning) had not been adequately explored in this literature. It demonstrated one measure of hot executive functioning, the Iowa Gambling Task (IGT), was sensitive to the impact of ABI and that people with ABI demonstrated impaired performance on the IGT. However, poorer IGT performance was unexpectedly associated with better functional outcome. The complexity of this relationship and possible contributing factors such as limited self-awareness were explored.