Reinforcement can be intrinsic , extrinsic or extraneous .

强化可以是内在的、外在的或无关的。

The key to understanding these behaviours lies in the difference between intrinsic and extrinsic motivation .

要理解这些行为的关键是区分内在动力和外在的动力。

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。

The most important intrinsic and extrinsic factors that determine energy balance health behaviours will be identified through multidisciplinary analysis , and translated into the evidence and theory-based energy intervention .

通过多学科的分析鉴定，并转换成证据和理论为基础的能量干预，将识别出决定能量平衡的健康行为最重要的内在因素和外在因素。

But people who primarily seek extrinsic rewards , such as money or status , often aren 't as happy , says richard ryan , professor of psychology , psychiatry and education at the university of rochester .

但是，罗切斯特大学（universityofrochester）的心理学、精神病学及教育学教授理查莱恩（richardryan）称，以追求外在回报（如金钱和地位）为主要目的的人常常不那么幸福。