New drugs that enhance cognition in cognitively healthy individuals present difficult public policy challenges. While their use is not inherently unethical, steps must be taken to ensure that they are safe, that they are widely available to promote equality of opportunity, and that individuals are free to decide whether or not to use them.

As science learns more about how the brain works, and fails to work, the possibility for developing "cognition enhancers" becomes more plausible. And the demand for drugs that can help us think faster, remember more, and focus more keenly has already been demonstrated by the market success of drugs like Ritalin, which tames the attention span, and Prozac, which ups the competitive edge. The new drug Aricept, which improves memory, most likely will join them. Whether such drugs are good for individuals, or for society, is an open question, one that demands far more public discussion.

Slowing the aging process would be one of the most dramatic and momentous ways of enhancing human beings. It is also one that mainstream science is on the brink of pursuing. The state of the science, together with its possible impact, make it an important example for how to think about research into all enhancement technologies.

Protection of human subjects from investigators' conflicts of interest is critical to the integrity of clinical investigation. Personal financial conflicts of interest are addressed by university policies, professional society guidelines, publication standards, and government regulation, but "intrinsic conflicts of interest"—conflicts of interest inherent in all clinical research—have received relatively less attention. Such conflicts arise in all clinical research endeavors as a result of the tension among professionals' responsibilities to their research and to their patients and both academic and financial incentives. These conflicts should be disclosed to research subjects and managed as assiduously as are financial conflicts of interest.

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