Athletes are returning to play too soon following a concussion, based on research conducted by scientists at the University of Toronto. The brain areas showing lingering differences–vision, planning and physial coordination–are especially concerning. These areas are critical for the students to avoid re-injury during sports participation. The researchers used advanced MRI to measure brain structure and function in 27 athletes within the first week after a concussion and again after they were medically cleared to return to play. The data was matched against a group of 27 uninjured varsity players. Here are the results: persistent differences in structure of the brain’s white matter that allows communication among different brain regions; differences in areas associated with vision, planning and bodily movement. Students in the study were male and female in seven different contact and non-contact sports.