The study investigated object permanence – the ability to understand that objects do not disappear from the world when they are out of sight, something that typically develops in the first year of life.
Portman’s study, led by neuroscientist Dr Abigail Baird, used a relatively new method for measuring brain function called near-infrared spectroscopy.
This technology relies on the fact that near-infrared light can penetrate the skull, and that blood carrying oxygen, and blood that has given up its oxygen, absorbs the light differently.
During the study, infants were shown a toy, which was then hidden under a cloth. Children who have object permanence – who know that it hasn’t disappeared – look for it under the cloth.
Children without this skill just ignore the cloth and look for something else to do, because the memory of the toy is gone.
The study tested 20 infants, every four weeks, from the ages of 5-12 months. To see what changed in the brain as the ability emerged, the researchers compared infrared light absorption from a time when the kids first looked for the toy, to an earlier time, when they just forgot that it existed when it was out of sight.
The paper was eventually published in the journal Neuroimage, under Natalie’s real name, with the title ‘Frontal lobe activation during object permanence: data from near-infrared spectroscopy’.
It has since been cited by at least 20 different studies that have built on its findings.
And if you want to read the study in full, it is available as a pdf file at the link below.
pdf of Neuroimage paper.
She's welcome to come muck around in my lab any old time...
Now linked by Wombat-socho (at the the other McCain).