Fig. 1.

Patent Race game. (A) After a fixation screen of a random duration between 4–8 s, subjects were presented with the Patent Race game for between 1–2 s, with information regarding their endowment, the endowment of the opponent, and the potential prize. (B) Subjects inputted the decision (self-paced) by pressing a button mapped to the desired investment amount from the initial endowment. (C) After 2–6 s, the opponent's choice was revealed. If the subject's investment is strictly more than those of the opponent, the subject won the prize; otherwise, the subject lost the prize. In either case, the subject kept the portion of the endowment not invested.