In two words: Maslow's hierarchy. [1]
The best places I know have people who are working from higher-layer motivations, and corporate cultures that encourage that by treating people as adults, supporting them, giving them wide latitude to get things done, et cetera.
The worse are the opposite. The people there are desperate for money to survive. The corporate cultures are disempowering, controlling, contemptuous.
It's commonly thought in the US that these are just two different sorts of people, the high-class creatives who should be given latitude, and the low-class proles who must be controlled like surly teens if they are to get anything done.
But that's not true. For example, Toyota's great success comes mainly from treating factory workers with deep respect. [2] And it works here, too. This American Life tells the story [3] of Toyota turning GM's worst plant into one of the best. Same people, just a different culture.
So if people are receiving a basic income, jobs will have to shift toward the model that motivates people through the higher end of Maslow's hierarchy. Money will be part of why people show up, but it would not longer be the only reason.
[1] http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs
[2] Liker's Toyota Kata is a great book on this.
[3] http://www.thisamericanlife.org/radio-archives/episode/403/n...