Reward Interference Task
aggression
Proactive aggression was measured by using a modified RIT (There were 44 trials in the RIT, with 20 trials for the high-reward condition (RMB 1–5), 20 trials for the low-reward condition (RMB 0.1–0.5) and 4 trials for the filler condition (no reward). The probability of winning/losing in each trial was pre-determined at the chance level, i.e. 50%, and the outcome of each trial was not shown immediately. Only two trials were randomly selected, and the final payment for this task was randomly determined in the range between 10 and 15 RMB. It took ∼11.5 min to finish the task.