A study has found a link between some elements of brain structure and
certain personality traits. The study, published
in the journal of Social Cognitive and Affective Neuroscience, involved
scanning the brains of 500 volunteers, and assessing their personalities in
terms of five traits: neuroticism, openness, extraversion, agreeableness, and
conscientiousness.
The researchers focused on
the structure of the cortex, the outer layer of the brain. They found that in
people who are more neurotic and prone to mood changes, the cortex tends to be
thicker and less wrinkly. People who appear more open – for example, curious
and creative – show the opposite pattern, that the cortex is thinner and more
wrinkly.
The link between brain structure
and personality may help explain how we mature as we get older. Folds and
wrinkles in the brain are thought to increase the surface area of the brain,
but make the cortex thinner. The cortex continues to stretch and fold
throughout childhood and adolescence, and into adulthood. As we grow up, people
generally become less neurotic, and more conscientious and agreeable.
“Our work supports the notion
that personality is, to some degree, associated with brain maturation,” says
Roberta Riccelli, at Magna Graecia University in Catanzaro, Italy.
These brain structures,
folds, and wrinkles are not detectable by merely looking at individuals – they are
only viewed by scanning the brain.
Photograph: Karen Kasmauski
MARTINA NICOLLS is an international
aid and development consultant, and the author of:- The Shortness of
Life: A Mongolian Lament (2015), Liberia’s Deadest Ends (2012), Bardot’s Comet
(2011), Kashmir on a Knife-Edge (2010) and The Sudan Curse (2009).
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