Individual participant model fits of the probability of waiting as a function of the proportion of the block, block, and condition. The delay to maximum reward was [5.0, 9.3] in the first block, [10.0, 14.3] in the second block, and [15.0, 19.3] in the third block and systematically increased from the lowest value at the beginning of each block to the highest value by the end (indicated respectively in brackets).