因此他着手试验液体。
第一组试验中，一群老鼠被置于一个装有能提供食物的操纵杆的笼子里，当老鼠推动操纵杆的时候，一滴液体食物(含有淀粉或糖的液体)就会掉出来。
In the first model, a group of mice were put in a cage with levers that dispensed food. When the mouse pushed a lever, a liquid treat — either a starchy or a sweet liquid — came out.
奇怪的是，老鼠更喜欢在第一组试验中那些代表需要大量付出的液体，不论是含淀粉的还是含糖的。
Surprisingly, the mice preferred the "high effort" liquid from the first experiment, no matter if it was starchy or sweet.
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