This is an interesting article. http://www.inc.com/geoffrey-james/gratitude-true-secret-to-success.html
The jist of the article is that glass half full people are more successful than glass half empty.. If you think about what things you have done well it will lead to success whereas if you dwell on the things that went wrong (even if they were a success) then it breeds internal resentment.
Certainly the brain can be conditioned and build negative emotions so there is no reason it cant build positive emotions.
My personal take on this is that there are some people who are perfection driven and they are quite clearly glass half empty people. These people tend to be "away from" motivated - their drive for perfection is they want to get away from imperfection.
This article is more about self gratitude however I think an interesting side effect of glass half empty mentality is that generally if they feel unhappy about their own progress they are probably going to feel unhappy about other people's progress. Showing gratitude to other people and recognising and rewarding effort, particularly when the person doesn’t feel confident of their abilities can be a powerful motivator.
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