That's not an excuse to give up. Understanding how unhealthy behaviors become deep­rooted has scientists learning some tricks that may help good habits replace the bad.“Why are bad habits stronger? You're fighting against the power of an immediate reward. We all as creatures give greater value to an immediate reward than something that's delayed，” says Dr.Nora Volkow, director of the National Institute on Drug Abuse.

　　Just how that bit of happiness turns into a habit involves a pleasure­sensing chemical named dopamine (多巴胺).

　　It trains the brain to want that reward again and again — increasing the connection each time — especially when it gets the right cue(暗示) from your environment.

　　People tend to overestimate their ability to resist temptations around them, thus destroying attempts to get rid of bad habits. Even scientists who recognize it find it hard to resist.“I don't like popcorn. But every time I go to the cinema, I have to eat it，” Volkow says.“It's fascinating.”

　　A movement to pay people for behavior changes may make use of that connection, as some companies offer employees immediate payments for adopting better habits. However paying for behavior turns out, researchers say there are some steps that may help counter your brain's hold on bad habits: repeat，repeat，repeat the new behavior — the same routine at the same time of day. Determined to exercise？Doing it at the same time of the morning makes the brain recognize the habit eventually. If you don't do it, you feel awful. Exercise itself raises dopamine levels, so eventually your brain will get a feel­good hit even if your muscles protest. Reward yourself with something you really desire, Volkow stresses. You exercised all week? Stuck to your diet? Buy a book, a great pair of jeans, or try a fancy restaurant.

【2017届高考英语一轮总复习精选测试题北师大版必修三Unit 7 A卷】相关文章：

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修8 Unit 2 Cloning

★ 2017届高考英语一轮总复习精选测试题北师大版必修三Unit 7 B卷

★ 2016年高考【英语】学科试题评析（四川卷）

★ 四川省2016届高考英语一轮复习课时作业（24） Module 6 Unexplained Mysteries of the Natural World 外研版必修4

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修3 unit3《The Million Pound Bank Note》

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 3 A卷 Word版含解析

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（3）模块1 《Unit 3 Celebration》（含解析） 北师大版必修1

★ 【浙江专用】2014届高考英语一轮复习课时作业(十六)必修4Unit 1《Women of achievement》

★ 2017届高考英语二轮复习课时训练：3（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍短文改错：创新押题（含解析）