We are looking for NCAA athletes (ages 18-30 years old), who do not have an active medical or psychiatric illness, are able to have MRI scanning done, and are either a college athlete who has experienced a concussion within the last 6 months or a college athlete who has not experienced a concussion to participate in our study. We are doing this study to try and see if there is a relationship between certain chemicals in the brain (measured with the MRI scanner) and cognitive function (the ability to plan and execute tasks) after a person experiences a concussion. We hope that if a relationship does exist, we can use the measurements of those brain chemicals to monitor a person’s recovery after a concussion. Compensation for study participation is $200. Contact Info: phone: 508-856-8183 or email: CCNI.Research@umassmed.edu (Please put Docket H00001821 in the subject line).