A research team that was headed by Dr. Sarah-Jayne Blakemore from Institute of Cognitive Neuroscience at the University College London have come up with their updates of their research.

They studied the brain activities of around 200 volunteers who were aged between 7 & 27 with the help of MRI scans. Researchers asked the volunteers to look at the alphabet which was displayed on the monitor screen in parallel, they were asked to decide whether the letters which appeared were curve or not & along with this two, they had to ignore distracting letters which were not in curved shape.

The results were pretty shocking, they found that teenagers brain had a lot of activities in the prefrontal cortex (This is the region which does all the decision making & multi-tasking activities).This was expected to happen only in the young minds but not with the teens & beyond.
Dr. Sarah-Jayne Blakemore concluded that, there is simply too much going in the brains of teens which results in poor concentration. hence, there is wastage energy & resources in the brain which is makes difficult in decision making.