personal identity

Effort, psychological continuity, human enhancement and superintelligence

One argument against human enhancement is that it is cheating. Cheating others and oneself. One may be cheating oneself for various reasons; because one took the easy path instead of actually acquiring a certain capacity, because once one enhances one is no longer oneself, because enhancements are superficial among others. I would like to try to develop further the intuition that “it is not the same person any more”. I will concentrate in forms of enhancement that involve less effort, are considered easier, or faster than conventional means because the cheating argument seems directed at them. In fact, most forms of non-conventional technological enhancements being proposed seem to be easier routes towards self-improvement. I will also explore how my considerations might mean trouble for any type of disruptive technology besides radical human enhancement, such as superintelligence or whole-brain emulation. Continue reading

Adding Happy People

Almost every week there’s a headline about our planet’s population explosion.  For instance Indian officials confirmed recently that India is projected to overtake China in just over a decade – to become the most populous country on Earth.  Many are worried that the planet is becoming increasingly overpopulated.  Whether it is overpopulated, underpopulated, or appropriately populated is a challenging ethical question.

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Punishment and Memory

The public outcry at the decision of the Crown Prosecution Service that Lord Janner was not fit to stand trial for 22 sex offences, the last of which were allegedly committed in the 1980s, appears to have led the CPS to initiate a review. Janner’s case raises several issues about the punishment of crimes that may have taken place in the relatively distant past. Continue reading

A Puzzle about Dementia


Dementia is one of the biggest challenges facing the British NHS, with one in three people developing the disease after the age of 65. This partly explains why there has been such excitement in scientific circles over intravenous immunoglobulin (IVIg), which appears to slow the rate of mental decline in sufferers from Alzheimer’s.

Obviously, from the societal point of view, dementia is a bad thing, and so this news is good. But from the personal point of view, should I be concerned about dementia – at least in its more severe forms? Epicurus famously claimed that we shouldn’t fear death, since when it arrives we won’t be around any more. Many seem to think the same about severe dementia, despite the fact that many – often the same people – also fear such a state.

Here’s how that view might arise. Imagine some extremely unpleasant experience, such as a very painful operation for which anaesthetic is for some reason unavailable. If you’re told you’re about to have such an operation, you will be very afraid, because you think the person under the knife will be you – it is you who will be feeling all that pain. But severe dementia can also be extremely unpleasant, so why isn’t it just like the operation?

There is one big difference. When the surgeon approaches you with her knife, you will have many of the same memories, beliefs, desires, and so on that you have right now. There will be a great deal of what Derek Parfit calls psychological connectedness and continuity between your mental states now and those you’ll have just before the operation. But that isn’t the case with dementia. You will have lost nearly all your memories, and so on. All that will be left is the capacity for conscious experience. And though that conscious experience might be deeply unpleasant, the line of thought goes, that doesn’t matter especially to you, since ‘you’ won’t be around any more, and there will be no important psychological continuity and connectedness between that individual and you now.

My own response to the prospect of dementia, however, is different. I can’t see why it matters very much whether, during the unpleasant experience, I have the same memories, beliefs, and so on that I do now. Consider the painful operation again. It might be so painful that you can’t *think* of anything else while it’s going on – so your memories, beliefs, and so on are entirely inaccessible. Does that somehow make it less bad? What I care about is what will be experienced by the capacity for consciousness I now possess, and if that capacity is going to be exercised in the future in such a way that there is consciousness of seriously unpleasant experiences – whether through some operation, or dementia – that concerns me now whatever memories, beliefs, and so on I am going to have, or indeed lack, in the future.