Fig. 1.

Trial procedure of the delay discounting task in the delay and the acceleration conditions. In both conditions, participants were presented with a choice between a smaller amount of money available sooner (SS) and a larger amount available later (LL). Time of delivery for the SS was either today (Now trial) or in 2 weeks (Not-Now trials), and the time of delivery for the LL was either 2 or 4 weeks after the SS. In the delayed condition, the default option presented to the subject was the SS amount, whereas in the accelerated condition it was the LL amount. This was indicated by the green triangle under the choice option. Amounts offered ranged from $15 to $85.