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Mice Prefer Treats They Worked Harder to Get

Maybe your dad said, “The harder you work for something, the more you’ll appreciate it.” Well, father really did know best. Because a new study finds that the harder mice have to work for a treat, the better it tastes. The research appears in the Proceedings of the Royal Society.

你老爸可能說過：“你越努力為某樣?xùn)|西工作，你就越欣賞它?！焙芎?，你父親確實(shí)知道得很多。因?yàn)橐豁?xiàng)新的研究發(fā)現(xiàn)，老鼠越努力去得到某種食物，這種食物味道就越好。這項(xiàng)研究刊登在《皇家學(xué)會學(xué)報(bào)》上。

Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water. Press the other and they get a drop of different tasting sugar water.

研究人員訓(xùn)練老鼠去推動控制桿，推動之后能得到兩種報(bào)酬中的一種——推動第一個控制桿，就會滲出一滴糖水；推動第二個控制桿，它們則能得到另一滴不同味道的糖水。

Then things got interesting. For one of the treats, scientists gradually increased the amount of effort required for the payoff—from one lever-press to five, then 10, then 15. So by the end of the session, one type of sugar water cost 15 times more effort than the other.

然后事情開始變得有趣了?？茖W(xué)家逐漸加大獲得其中一種糖水的難度，從剛開始的推動一次控制桿，到后來的推動五次、十次……再到最后要你推動十五次。因此，在實(shí)驗(yàn)的最后時間里，獲得這種糖水消耗的精力是獲得另一種的十五倍。

The mice then retired to their home cage where both treats were freely available. And they showed a strong preference for whichever reward they’d worked harder to obtain. Based on how fast the mice sipped, they appeared to find the costlier sugar water more tasty.

隨后這些老鼠回到它們的籠子里，這時兩種糖水都是無償供應(yīng)的。老鼠們對那種更難獲得的糖水表現(xiàn)出強(qiáng)烈的偏愛。根據(jù)它們喝水的速度推斷，看來老鼠們覺得代價更高的糖水味道更好。

Which makes evolutionary sense. An animal wouldn’t survive if a little hard work left a bitter taste in its mouth.

這結(jié)果有著一定的進(jìn)化意義。假如加倍努力只能換來滿嘴的苦澀，那這種動物就不會努力讓自己存活下來了。

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