City dwellers at higher risk of psychiatric illnesses than country dwellers: study

City dwellers are at a higher risk of psychiatric illnesses such as depression, anxiety disorders, and schizophrenia than country dwellers, a study conducted at the Max Planck Institute for Human Development found.

Comparisons show higher activity levels in city dwellers’ than in country dwellers’ amygdala — a central nucleus in the brain that plays an important role in stress processing and reactions to danger.

Which factors can have a protective influence?

A research team led by psychologist Simone Kühn has examined which effects nature near people’s homes such as forest, urban green, or wasteland has on stress-processing brain regions such as the amygdala.

“Studies of people in the countryside have already shown that living close to nature is good for their mental health and well-being. We therefore decided to examine city dwellers,“ explains Simone Kühn.

Indeed, the researchers found a relationship between place of residence and brain health: those city dwellers living close to a forest were more likely to show indications of a physiologically healthy amygdala structure and were therefore presumably better able to cope with stress.

This effect remained stable when differences in educational qualifications and income levels were controlled for. However, it was not possible to find an association between the examined brain regions and urban green, water, or wasteland.

With these data, it is not possible to distinguish whether living close to a forest really has positive effects on the amygdala or whether people with a healthier amygdala might be more likely to select residential areas close to a forest. Based on present knowledge, however, the researchers regard the first explanation as more probable.

Further longitudinal studies are necessary to accumulate evidence.

The participants in the present study are from the Berlin Aging Study II (BASE-II) – a larger longitudinal study examining the physical, psychological, and social conditions for healthy ageing. In total, 341 adults aged 61 to 82 years took part in the present study.

Apart from carrying out memory and reasoning tests, the structure of stress-processing brain regions, especially the amygdala, was assessed using magnetic resonance imaging (MRI). In order to examine the influence of nature close to peoples’ homes in these brain regions, the researchers combined the MRI data with geoinformation about the participants’ places of residence.

This information stemmed from the European Environment Agency’s Urban Atlas, which provides an overview of urban land use in Europe.

“Our study investigates the connection between urban planning features and brain health for the first time,” says co-author Ulman Lindenberger, Director of the Center for Lifespan Psychology at the Max Planck Institute for Human Development.

By 2050, almost 70 percent of the world population is expected to be living in cities. These results could, therefore, be very important for urban planning.

In the near future, however, the observed association between the brain and closeness to forests would need to be confirmed in further studies and other cities, stated Ulman Lindenberger.