So the folklore may be right: people who are in touch with their heart are more likely to be swayed by their instincts – for good or bad. All of which prompted Ibanez to wonder what would happen when you are fitted with an artificial heart? If Carlos experienced substantial changes, it would offer important new evidence that our mind extends well beyond the brain.
And that is exactly what he found. When Carlos tapped out his pulse, for instance, he followed the machine’s rhythms rather than his own heartbeat. The fact that this also changed other perceptions of his body – seeming to expand the size of his chest, for instance – is perhaps to be expected; in some ways, changing the position of the heart was creating a sensation not unlike the famous “rubber hand illusion”. But crucially, it also seemed to have markedly altered certain social and emotional skills. Carlos seemed to lack empathy when he viewed pictures of people having a painful accident, for instance. He also had more general problems with his ability to read other’s motives, and, crucially, intuitive decision making – all of which is in line with the idea that the body rules emotional cognition. “It is a very interesting, very intriguing study,” says Dunn of the findings.
Dunn, who is a clinical psychologist, is more concerned about its relevance to depression. “At the moment therapy is very much in the head – we change what the client thinks and trust that their emotions will follow up,” he says. “But I often hit a wall: they say that they know these things intellectually, but emotionally they can’t feel it.”
Along these lines, Furman has found that people with major depressive disorder (but without other complications like anxiety) struggle to feel their own heart beat; and the poorer their awareness, the less likely they were to report positive experiences in their daily life. And as Dunn’s work on decision making would have suggested, poor body perception also seemed to be linked to measures of indecision – a problem that blights many people with depression. Furman stresses, however, that there may be many different kinds of depression, and poor bodily awareness may only influence some of them.
http://www.bbc.com/future/story/20141205-the-man-with-two-hearts
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