Immature brain behind kids’ selfish behaviour
Washington: Egocentric behaviour in children may be blamed on the immaturity of a brain region involved in self-control, a new study has suggested.
Human social interactions often involve two parties who want to maximize their own outcomes while reaching a mutually satisfactory result. It is generally accepted that over the course of childhood behaviour shifts from a more selfish focus to an increased tendency to consider the benefits to others.
However, little is known about age-related changes in this type of “strategic social behaviour” or the underlying neuronal mechanisms.
Researchers from the Max-Planck Institute for Cognitive and Brain Sciences in Leipzig conducted behavioural and brain-imaging studies comparing children of different ages as they engaged in two carefully constructed games called “The Dictator Game” and “The Ultimatum Game.”
In the Dictator Game, children were asked to share a reward with another child who could only passively accept what was offered. In the Ultimatum Game, the recipient had to accept the offer or neither child received a reward. Therefore, the games differed in the demand for strategic behaviour for the child making the offer.
“We were interested in whether children would share more fairly if their counterparts could reject their offers, and to what extent strategic behaviour was dependent on age and brain development,” explained lead study author, Dr. Nikolaus Steinbeis.
“We observed an age-related increase in strategic decision making between ages 6 to 13 years and showed that changes in bargaining behaviour were best accounted for by age-related differences in impulse-control abilities and underlying functional activity of the left dorsolateral prefrontal cortex, a late-maturing brain region linked with self control,” said Dr. Steinbeis.
The results suggest that egocentric behaviour in children may not be a function of an inability to know “fair” from “unfair,” but is instead due to an immature prefrontal cortex that does not support altruistic behavior when faced with a situation that has a strong self-serving incentive.
“Our findings represent a critical advance in our understanding of the development of social behaviour with far-reaching implications for educational policy and highlight the importance of helping children act on what they already know. Such interventions could set the foundation for increased altruism in the future,” concluded Dr. Steinbeis.
The study was published by Cell Press in the March 8 issue of the journal Neuron.
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