“Some studies say around five per cent of children at some point show signs of ADHD,” says Lawson Health Research Institute Scientist Dr. Lena Palaniyappan. However, due to the fact there is no objective testing for this condition it can be hard to properly diagnose...“One of the things we were interested in was to understand why some children respond to treatment and why others don’t. So we were looking at genetic aspects of the disease and wanted to see how the brain gets affected when some genes are different in these children.”