Reproductive technologies such as in-vitro fertilization (IVF) and preimplantation genetic diagnosis (PGD) mean it is currently possible for parents to create a range of embryos and make decisions about which to implant on the basis of their genetic makeup. One interesting possibility is that we will soon be able to use such technologies to influence the intelligence of our future children. It is known that intelligence has at least a moderately important genetic component. Identical twins are significantly more similar in intelligence than dizygotic twins, who are in turn significantly more similar than adopted siblings raised together. In fact, a range of studies indicate that the heritability of intelligence is approximately 0.7, which is only slightly lower than the heritability of height. This means that 70% of the variation we observe in intelligence is due to genetic factors. Once we can identify the genes which explain this variation it will be relatively simple to test embryos for them, meaning it will be technically possible for parents to select embryos on the basis of their likely intelligence.
However scientists are finding it surprisingly difficult to locate the specific genes which affect intelligence. Continue reading
In light of the fact that many readers will have an assortment of Christmas treats tempting them, I thought a post on impulse control would be timely.
In the now paradigmatic Stanford marshmallow experiment, children were given an option – one marshmallow which they could have immediately, or two marshmallows, provided they could wait 15 minutes. This option presents a problem of sorts. Is it better to have a small reward immediately, or a larger one after some delay? Common sense says that waiting is the better option. Doubling your reward whilst only paying a marginal cost of your time seems like the rational thing to do. Children who fail to wait are, therefore, seen as succumbing to temptation. A deficiency in self control leads them to make a poor decision. Continue reading
In the final Uehiro Seminar of 2012, Brian Earp provides an absorbing analysis of the science and ethics of anti-love biotechnology. You can listen to the seminar here.
While some personal distress as a result of love may be an important means of self-development, certain forms of love may be particularly perilous. Examples given by Earp include an older person’s sexual love for a child, incestuous love, and the love that prevents an abused spouse from leaving their partner. In these cases love can become like an ‘interpersonal heroin’ – an individual may recognise the harm their love is causing them, but be unable to stop feeling it. Continue reading
Earlier this year, scientists published a study that detailed the successful use of an artificial uterus to bring shark embryos to term. Once ‘birthed’ the shark pups showed no detrimental effects as a result of having gone through development in an artificial setting.
Research such as this ignites interest in the possibility of creating artificial wombs for the purpose of human reproduction. After all – artificial hearts, kidneys and lungs are all available and becoming increasingly sophisticated. It is surely only a matter of time before artificial wombs, capable of growing and developing a foetus outside the human body, are technologically feasible.
This raises the question of whether we should promote research aimed at shifting the location of foetal development to outside the human body. As a way of approaching some of the issues surrounding this prospect let’s consider a hypothetical scenario. Continue reading