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Sick man walking: Perception of health status from body motion
Stockholm University, Faculty of Social Sciences, Department of Psychology. Karolinska Institutet, Sweden.
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2015 (English)In: Brain, behavior, and immunity, ISSN 0889-1591, E-ISSN 1090-2139, Vol. 48, 53-56 p.Article in journal (Refereed) Published
Abstract [en]

An ability to detect subtle signs of sickness in others would be highly beneficial, as it would allow for behaviors that help us avoid contagious pathogens. Recent findings suggest that both animals and humans are able to detect distinctive odor signals of individuals with activated innate immune responses. This study tested whether an innate immune response affects a person's walking speed and whether other people perceive that person as less healthy. 43 subjects watched films of persons who were experiencing experimental immune activation, and rated the walking individuals in the films with respect to health, tiredness, and sadness. Furthermore, the walking speed in the films was analyzed. After LPS injections, participants walked more slowly and were perceived as less healthy and more tired as compared to when injected with placebo. There was also a trend for the subjects to look sadder after LPS injection than after placebo. Furthermore, there were strong associations between walking speed and the appearance of health, tiredness, and sadness. These findings support the notion that walking speed is affected by an activated immune response, and that humans may be able to detect very early signs of sickness in others by merely observing their gait. This ability is likely to aid both a "behavioral immune system", by providing more opportunities for adaptive behaviors such as avoidance, and the anticipatory priming of biochemical immune responses.

Place, publisher, year, edition, pages
2015. Vol. 48, 53-56 p.
Keyword [en]
Behavioral immune system, Biological motion, Innate immunity, Sickness, Sickness avoidance
National Category
Health Sciences
URN: urn:nbn:se:su:diva-119637DOI: 10.1016/j.bbi.2015.03.007ISI: 000358460700008PubMedID: 25801061ScopusID: 2-s2.0-84925870657Local ID: P-3267OAI: diva2:847191
Available from: 2015-08-19 Created: 2015-08-19 Last updated: 2015-08-31Bibliographically approved

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Sundelin, TinaLekander, MatsAxelsson, John
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