1. 1s = 1cm Ultimatum Given (5s Max) Participant make a choice. (RT) RT 0.5-2.5s 2s Min: ~3s, Max: 9.5s Ultimatum Game Decision Modeling: Feedback Fixation Cross 2s2s0.5s 500ms Jitter from 0 - 2s; average 1s Average trial length: 4s. 5 Fairness Levels: 25 Fairness x Jitter 5 Repeats = 125 trials = 625s on average. 10minutes.

2. 1s = 1cm Dice Pattern Shown, Input (5s Max) Participant make a choice. (RT) RT 0-2s 2s Min: ~ 3s, Max: 9s Dices Decision Modeling: Feedback Fixation Cross 2s2s0.5s 250 ms interval Jitter for 0 – 2s; average 1s Average trial length: 0.5+2+1 = 3.5s

3. 1s = 1cm Participant make a choice. (RT) Proposed IGT-MEG Version Feedback Fixation Cross 500ms Jitter from 0.5 – 2.5s; average 1.5s Average trial length: 0.5+2+1.5 = 4s. No response results in very short crosshair. Min: ~3s, Max: 9.5s “PICK A CARD” (5s Max) 0.5-2.5s 2s 2s2s0.5s RT