The neurobiology of social distance: Why loneliness may be the biggest threat to survival and longevity

Summary: Study explores the wide-ranging, negative effects of social isolation on both psychological and physiological well-being.

Source: University of Oxford

Never before have we experienced social isolation on a massive scale as we have during the evolving COVID-19 pandemic. A new paper published in the journal Trends in Cognitive Sciences explores the wide-ranging, negative consequences that social isolation has on our psychological well-being and physical health, including decreased life span. The paper was co-authored by Associate Professor Danilo Bzdok (McGill University and Mila Quebec Artificial Intelligence Institute) and Emeritus Professor Robin Dunbar (University of Oxford).

Through examining a broad range of studies, a full picture emerged of the severe impact that loneliness can have, namely that:

  • having strong interpersonal relationships is critical for survival across the entire lifespan;
  • social isolation is a significant predictor of the risk of death;
    insufficient social stimulation affects reasoning and memory performances, hormone homeostasis, brain grey/white-matter, connectivity and function, as well as resilience to physical and mental disease;
  • feelings of loneliness can spread through a social network, causing negatively skewed social perception, escalating morbidity and mortality, and, in older people, precipitating the onset of dementia, such as Alzheimer’s disease.

Loneliness directly impairs the immune system, making us less resistant to diseases and infections. Indeed, feeling lonely and having few friends can result in a particularly poor immune defence. People who are more socially integrated, however, have better adjusted biomarkers for physiological function, including lower systolic blood pressure, lower body mass index, and lower levels of C-reactive protein (another molecular response to inflammation).

Humans are intensely social and benefit psychologically and physically from social interaction. The tighter we are embedded in a network of friends, for example, the less likely we are to become ill and the higher our rates of survival. People who belong to more groups, such as sports clubs, church, or hobby groups, have been found to reduce their risk of future depression by almost 25%.

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This shows a woman standing alone by a tree
Loneliness directly impairs the immune system, making us less resistant to diseases and infections. Image is in the public domain.

Associate Professor & Canada CIFAR Artificial Intelligence Chair Danilo Bzdok, said, ‘We are social creatures. Social interplay and cooperation have fuelled the rapid ascent of human culture and civilization. Yet, social species struggle when forced to live in isolation. From babies to the elderly, psychosocial embedding in interpersonal relationships is critical for survival. It is now more urgent than ever to narrow the knowledge gap of how social isolation impacts the human brain as well as mental and physical well-being.’

Emeritus Professor of Evolutionary Psychology Robin Dunbar, said, ‘Loneliness has accelerated in the past decade. Given the potentially severe consequences this can have on our mental and physical health, there is growing recognition and political will to confront this evolving societal challenge. As one consequence, the United Kingdom has launched the ‘Campaign to End Loneliness’ – a network of over 600 national, regional and local organizations to create the right conditions for reducing loneliness in later life. Such efforts speak to the growing public recognition and political will to confront this evolving societal challenge. These concerns can only be exacerbated if there are prolonged periods of social isolation imposed by national policy responses to extraordinary crises such as COVID-19.’

About this neuroscience research article

Source:
University of Oxford
Media Contacts:
Press Office – University of Oxford
Image Source:
The image is in the public domain.

Original Research: Closed access

The Neurobiology of Social Distance”.
by Danilo Bzdok, Robin I.M. Dunbar.
Trends in Cognitive Sciences doi:10.1016/j.tics.2020.05.0167

Abstract


The Neurobiology of Social Distance

Never before have we experienced social isolation on such a massive scale as we have in response to COVID-19. Yet we know that the social environment has a dramatic impact on our sense of life satisfaction and well-being. In times of distress, crisis, or disaster, human resilience depends on the richness and strength of social connections, as well as active engagement in groups and communities. Over recent years, evidence emerging from various disciplines has made it abundantly clear: loneliness may be the most potent threat to survival and longevity. Here, we highlight the benefits of social bonds, choreographies of bond creation and maintenance, as well as the neurocognitive basis of social isolation and its deep consequences for mental and physical health.

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