On the other hand when we do something because we receive some reward, like a certificate or money, this is extrinsic motivation.
另一方面当我们为了得到奖励而去做某事的时候，比如证书或者金钱，就是外在的动机。
Motivation might have been an issue, as the experiment did not count for class credit, though the highest scorer in each group earned a $15 iTunes gift certificate.
动机水平可能是一个导致差异的原因，研究者们并没有考虑学生们的银行信用状况这个因素，虽然每个小组获的最高分的人都可以得到15美元的itunes礼卷。
Motivation might have been an issue, as the experiment did not count for class credit, though the highest scorer in each group earned a $15 iTunes gift certificate.
动机水平可能是一个导致差异的原因，研究者们并没有考虑学生们的银行信用状况这个因素，虽然每个小组获的最高分的人都可以得到15美元的itunes礼卷。
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