Scientists investigating bipolar disorder invited participants to make safe or risky gambles as they spun the wheel in a game of roulette.
Brain activity was measured using a functional magnetic resonance imaging (fMRI) scan that monitors blood flow in the brain.
Professor Wael el-Deredy, from the University of Manchester, said in the journal Brain:
The greater buzz that people with bipolar disorder get from reward is a double-edged sword.
On the one hand, it helps people strive towards their goals and ambitions ...
However, it comes at a cost; these same people may be swayed more by immediate rewards when making decisions and less by the long-term consequences of these actions.