AT THE MOST FUNDAMENTAL LEVEL, the drugs challenge perceptions of who we are. Some people believe the next big scientific revolution will be turning our technological prowess on the world within, notably our brains, rather than the world around us. Neuroscience, which includes the development of brain enhancers, is part of this "revolution." Critics argue more time is needed with the petri dishes and field testing before the drugs are used as mind enhancers. "It's not really a piece of science. It's an editorial arguing that we should use more drugs," says George Annas, chairman of the department of Health Law, Bioethics, and Human Rights at Boston University.