Scientists take drugs to boost 'brainpower'

Twenty percent of scientists admit to using performance-enhancing prescription drugs for non-medical reasons, according to a survey released on Wednesday by Nature, Britain's top science journal.

The overwhelming majority of these med-taking brainiacs said they indulged in order to "improve concentration," and 60 percent said they did so on a daily or weekly basis.

The 1,427 respondents - most of them in the United States - completed an informal, online survey posted on the "Nature Network" Web forum, a discussion site for scientists operated by the Nature Publishing Group.