ADHD (2 of 3) (IMAGE) King's College London Caption ADHD is linked to lack of dopamine, which causes impaired executive functions. In people with ADHD the altered connections that are important for executive functions can be visualized with diffusion Tractography (yellow tint), an MRI technique pioneered by Professor Marco Catani at King's College London. Credit Professor Marco Catani, King's College London Usage Restrictions Only to be used in reporting of the paper: 'Leonardo da Vinci: a genius driven to distraction' by Catani & Mazzarello, BRAIN, DOI: 10.1093/brain/awz131 License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.