Genes linked to creativity could also increase the risk of developing schizophrenia and bipolar disorder, according to new research from King's College London and deCODE Genetics.
It has long been suggested that creativity and psychosis show certain similarities, with notable examples of artists such as Vincent Van Gogh who themselves suffered from psychiatric illnesses. Previous studies have shown that psychiatric disorders, particularly bipolar disorder, tend to be found in the same families where creative professions are common.
However, until now it had not been possible to pinpoint whether this was simply due to shared environmental factors or socioeconomic status.
Although creativity is difficult to define for scientific purposes, researchers consider a creative person to be someone who takes novel approaches requiring cognitive processes that are different from prevailing modes of thought or expression. Schizophrenia and bipolar disorder are disorders of thoughts and emotions, which means that those affected show alterations in cognitive and emotional processing.
Genetic risk scores for schizophrenia and bipolar disorder were examined in a sample of 86,292 individuals from the general population of Iceland, in collaboration with researchers from deCODE Genetics, who provided the data. In the study, creative individuals were defined as those belonging to the national artistic societies of actors, dancers, musicians, visual artists and writers.
Researchers found that genetic risk scores for both schizophrenia and bipolar disorder were significantly higher in those defined as creative individuals, with scores approximately halfway between the general population and those with the disorders themselves.
These findings lend support to the direct influence of genetic factors on creativity, as opposed to the effect of sharing an environment with individuals who have schizophrenia or bipolar disorder.
Robert Power, of the Medical Research Council's Social, Genetic and Developmental Psychiatry Centre at King's College London, said: "For most psychiatric disorders little is known about the underlying biological pathways that lead to illness. An idea that has gained credibility is that these disorders reflect extremes of the normal spectrum of human behaviour, rather than a distinct psychiatric illness. By knowing which healthy behaviours, such as creativity, share their biology with psychiatric illnesses we gain a better understanding of the thought processes that lead a person to become ill and how the brain might be going wrong.
"Our findings suggest that creative people may have a genetic predisposition towards thinking differently which, when combined with other harmful biological or environmental factors, could lead to mental illness."
The paper, Polygenic risk scores for schizophrenia and bipolar disorder predict creativity, is published in Nature Neuroscience.
