**Experiment and Compensation Guide**

In each trial of the choose-and-solve task, you will be provided two options; solve either an easy problem with low reward or solve a hard problem with high reward. In easy problems, we expect that you will get more than 90% correct. In hard problems, the difficulty is adaptive to your competence, so that you will perform at about 70% correct for both word and math problems. You should choose what type of problem you want to solve **within 3 seconds**, otherwise you will be directed to the easy problem. Then, you will be presented with a problem of your choice, which you have to solve **within 7 seconds**. You will earn the points if you get the problem correct.

The choose-and-solve task consists of practice word and math problems, choice-making practice, and five main blocks of 28 trials each, i.e., 140 main trials. **The points you earned in the main blocks will be converted into cash bonus at the exchange rate of 1₵/point.** The maximum point you can earn from those blocks is 540, so the maximum bonus on top of the base compensation ($2.00) are $7.40. For example, if you score 400 points, your total compensation will be $6.00.
**So, maximize your earnings by maximizing your points! **

Finally, please do not use a smartphone or calculator. We are interested in how people do these problems without any extra help.

**Suggestions for using keys**

Press the **"i"** key to select options presented on the left side of the screen, the **"o"** key to select options presented in the middle of the screen, and the **"p"** key to select options presented on the right side of the screen. An example of how you should place your fingers on the keyboard is pictured below.

*After a short break, please click Next Button to proceed. You will begin with the practice problems.*