Why We Only Learn to Understand Other People After the Age of Four
When we are around four years old we suddenly start to understand that other people think and that their view of the world is often different from our own. Researchers in Leiden and Leipzig have explored how that works.
At around the age of four we suddenly do what three-year-olds are unable to do: put ourselves in someone else’s shoes. Researchers at the Max Planck Institute for Human Cognitive and Brain Sciences (MPI CBS) in Leipzig and at Leiden University have shown how this enormous developmental step occurs: a critical fibre connection in the brain matures. Senior researcher and Leiden developmental psychologist Nikolaus Steinbeis, co-author of the article, took part in the research. Lead author, PhD candidate Charlotte Grosse-Wiesmann, worked under his supervision.
Little Maxi
If you tell a 3-year-old child the following story of little Maxi, they will most probably not understand: Maxi puts his chocolate on the kitchen table, then goes to play outside. While he is gone, his mother puts the chocolate in the cupboard. Where will Maxi look for his chocolate whenhe comes back? A 3-year-old child will not understand why Maxi would be surprised not to find the chocolate on the table where he left it. It is only by the age of 4 years that a child will correctly predict that Maxi will look for his chocolate where he left it and not in the cupboard where it is now.
Theory of Mind
The researchers observed something similar when they showed a 3-year-old child a chocolate box that contained pencils instead of chocolates. When the child was asked what another child would expect to be in the box, they answered “pencils”, although the other child would not know this.
The maturation of fibres of a brain structure called the arcuate fascicle (green) between the ages of three and four years establishes a connection between two critical brain regions: a region (brown) at the back of the temporal lobe that supports adults thinking about others and their thoughts, and a region (red) in the frontal lobe that is involved in keeping things at different levels of abstraction and, therefore, helps us to understand what the real world is and what the thoughts of others are.
Independent development
The researchers have now discovered what is behind this breakthrough. The maturation of fibres of a brain structure called the arcuate fascicle between the ages of three and four years establishes a connection between two critical brain regions: a region at the back of the temporal lobe that supports adult thinking about others and their thoughts, and a region in the frontal lobe that is involved in keeping things at different levels of abstraction and, therefore, helps us to understand what the real world is and what the thoughts of others are.
Only when these two brain regions are connected through the arcuate fascicle can children start to understand what other people think. This is what allows us to predict where Maxi will look for his chocolate. Interestingly, this new connection in the brain supports this ability independently of other cognitive abilities, such as intelligence, language ability or impulse control.
Contacts and sources:
Citation: White matter maturation is associated with the emergence of Theory of Mind in early childhood. Grosse Wiesmann, C., Schreiber, J., Singer, T., Steinbeis, N., & Friederici, A. D. (in press). Nature Communications, March 21, 2017
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