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sonScientists and philosophers gathered in Helsinki last week for TransVision, a conference about 'enhancing' humans. Here are some bits from an interview with the director of the Future of Humanity Institute at the University of Oxford:

Nature: This sort of thing (cognitive enhancement) must be fraught with ethical concerns. What sorts of issues come up?

Nick Bostrom: One issue that always comes up is: will it lead to inequality between those who have access to it and those who don't? Price makes a huge difference to accessibility, and one presentation at the conference tried to estimate the costs of different kinds of cognitive enhancements. These depend very much on the form the enhancement takes. If it's a pill, it can be expected to get cheaper quickly over time [as patents run out and materials get easier to produce]. If it's a procedure, there's a limit to how cheap that can be, at least until we get robots to do it for us.

Nature: So what kinds of enhancement are people thinking about?

7o9kissNick Bostrom: <> In the context of marriage, an interesting possibility is the use of pharmaceuticals to regulate the pair-bonding mechanism. There are a small number of hormones, such as vasopressin and oxytocin, that might help us form bonds with others. It could be possible to prevent the levels of these chemicals from trailing off, and to infuse romance into fading marriages — like a technological form of counselling. [Source]
John B. Chilton (guest) meinte am 24. Aug, 19:03:
Why we love
I recommend Why We Love: The Nature and Chemistry of Romantic Love: Books: Helen Fisher to anyone interested in understanding the operation of brain chemicals on love. Note I said "understanding." She's not advocating or suggesting as much as Bostrom. 
Meh (guest) meinte am 24. Aug, 21:17:
While I think all of this research is cool stuff, I suspect that the medical researchers (or at least the journalists) are drastically underestimating the potential unintended consequences of these drugs/treatments.

I remember reading one critique about memory enhancing drugs. Basically, people forget things for good reason but since (at least at this point) the drugs cannot target specific memories, people were remembering a lot of negative things that they would have been better off forgetting. 
roger (guest) meinte am 24. Sep, 19:45:
Nick Bostrom
Nick Bostrom: <> In the context of marriage, an interesting possibility is the use of pharmaceuticals to regulate the pair-bonding angelsdream.com.au/