Oxytocin is a naturally occurring brain chemical that is nicknamed the "love hormone" because it seems to play a role in the formation of social relationships such as mating pairs and child-parent bonding. A recent study demonstrated that ocytocin appears to increase people's tendency to trust others. Using an investment game, the study demonstrated that people who inhaled oxytocin were more than likely to give their money to a trustee compared to the people who inhaled placebo. For this experimental study, identify the independent variable and the dependent variable.