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Do we all have the capacity for synaesthesia or is the brain's ability to blend senses bestowed on a select few at birth? It now seems it could be a mixture of the two.
Synaesthesia seems to underpin some savants' enhanced memory and numerical skills. The hope is that a better understanding of its origins could help to explain savant abilities - and perhaps even shine some light on whether we are all capable of attaining them.
The condition is thought to arise when extra connections in the brain cross between regions responsible for separate senses. To see if genes play a role in building or maintaining these connections, a team led by Julian Asher at the University of Oxford took genetic samples from 196 individuals from 43 families, 121 of whom exhibited auditory-visual synaesthesia, meaning they "see" sounds. "When I hear a violin, I see something like a rich red wine," says Asher, who is a synaesthete. "A cello is more like honey."
From their analysis, the team were able to pin down four chromosomal regions where gene variations seemed to be linked to the condition (
The American Journal of Human Genetics, DOI:
link). As one of the regions has also been associated with autism, there may be a common genetic mechanism underlying the two, says Asher.
So if we are genetically disposed to develop synaesthesia, does that rule out the possibility of inducing the experience? To find out, Roi Cohen Kadosh from Imperial College London and colleagues hypnotised four volunteers so that they viewed numbers as having innate colours, known as grapheme-colour synaesthesia. The volunteers then looked at a series of coloured slides, some with a black digit in the centre and some without.
Comment: An 'ethics code' is to be programmed into killing machines by people who apparently do not themselves know what it means to be human? We do not find that reassuring. The robots will not "understand the difference between enemies and non-combatants" because an increasing number of their programmers and controllers are themselves biological Terminator machines incapable of empathy.