Adina Roskies is a neurophilosopher with a strong interest in neuroethics. (See a list below with some of her contributions to the field.) Recently she spoke on the topic of cognitive enhancement at a conference called Forbidding Science at Arizona State University. Also speaking on the same topic at this event were Nick Bostrom and Carl Elliott. Videos of all three presentations are now up at the Institute for Ethics and Emerging Technologies's website.
Adina Roskies's papers on neuroethics
Roskies, A. (2002): Neuroethics for the new millennium. Neuron 35:21-23.
Roskies, A. (2003): Are ethical judgments intrinsically motivational? Philosophical Psychology 16: 51-66.
Roskies, A. (2006): A case study of neuroethics: The nature of moral judgment. In Illes, J., ed. (2006): Neuroethics. Oxford: Oxford UP.