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Experimental paradigm. Each trial began with two options (number “9” and “99”) that appeared on either side of a fixation point. The participants then selected one of the two alternatives by pressing a button. Following their responses, a fixation point was presented in the center of the monitor for 2,000 ms; thereafter, a positive or negative number appeared for 1,000 ms. Each trial ended with an intertribal interval (ITI) varying randomly from 900 to 1,100 ms.
