Image 2 Axial functional MRIs (IMAGE) Radiological Society of North America Caption Axial functional MRIs show analysis of the interaction between concussion history and playing position for the task related functional MRI blood oxygen level-dependent response during a working memory N-back task. Each task-level contrast was modeled separately: 1-back greater than 0-back (orange), 2-back greater than 1-back (red), 2-back greater than 0-back (blue). Clusters with a significant interaction between concussion history and playing position are overlaid on the Montreal Neuroimaging Institute template brain. Credit Radiological Society of North America Usage Restrictions May use with credit. 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.