New research has found that body maps that help us build up an implicit sense of ourselves through the sense of having a body and seeing and feeling our bodies move develop very early in our life.
Body maps show how certain parts of the brain correspond point-for-point with the body's topography. While body maps have been studied extensively in adult humans, the new research studied body maps in the infant brain.
"Body maps in the brain are an important part of how we build up an implicit sense of ourselves through the sense of having a body and seeing and feeling our bodies move," said lead author Peter Marshall, professor of psychology at Temple University in Pennsylvania, US.
In one experiment, seven-month-old babies wore caps fitted with sensors that record brain activity by picking up tiny electrical signals from the surface of the head, a method known as electroencephalography, or EEG.
The study found that touches to infants' hands and feet resulted in different patterns of activity in the part of the brain that processes touch.
The results showed that, much as in adults, the body maps of infants are organized in a particular way.
Another study using EEG showed that body maps in the infant brain are also activated by seeing other people carrying out actions with different parts of the body.
Taken together, the researchers say, the findings demonstrate that body maps develop early in life and may be integral for fostering infants' sense of their own bodies, as well as the ability to connect with and learn from other people.
"We think this connection happens very early in development and allows infants to get a sense that other people are like them, because they move in similar ways," Marshall noted.
The findings appeared in the journal Trends in Cognitive Sciences.